Dissertations / Theses: 'Aluminum Materials'

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Lebeau, Thomas. "Wetting of alumina-based ceramics by aluminum alloys." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68039.

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During the last 20 years, ceramic fiber reinforced metal matrix composites, referred to as MMCs, have provided a relatively new way of strengthening metals. High specific modulus and a good fatigue resistance in dynamic loading conditions or for high temperature applications make these composites very attractive for replacing classic alloys. The first requirement for the fabrication of MMCs, especially by processes involving liquid metals, is a certain degree of wetting of fibers by the liquid metal which will permit a good bonding between the two phases.
The conventional experimental approach to wettability consists of measuring the contact angle of a drop of the liquid metal resting on flat substrate of the ceramic reinforcement materials.
This work deals with the fabrication of eutectic $ rm ZrO sb2/Al sb2O sb3 (ZA), ZrO sb2/Al sb2O sb3/TiO sb2$ (ZAT), and $ rm ZrO sb2/Al sb2O sb3/SiO sb2$ (ZAS) ceramic substrates and the study of their wetting behavior by different classes of Al alloys. Wetting experiments were performed under high vacuum or under ultra high purity Ar atmosphere. Four major variables were tested to study the wetting behavior of the different ceramic/metal systems. Variables include holding time, melt temperature, alloy and ceramic compositions.
Ceramic materials were sintered under vacuum at temperatures ranging from 1500$ sp circ$C to 1790$ sp circ$C for 2.5 hours, and achieved over 96% of the theoretical density. An experimental set-up was designed to measure in-situ contact angles using the sessile drop method. For any ceramic substrate, a temperature over 950$ sp circ$C was necessary to observe an equilibrium wetting angle less than 90$ sp circ$ with pure Al; by alloying the aluminum, wetting could be observed at lower temperatures ($ theta$ = 76-86$ sp circ$ at 900$ sp circ$C for Al-10wt%Si, $ theta sim72 sp circ$ at 850$ sp circ$C for Al-2.4wt%Mg). Finally, ZAS specimens reacted with molten Al alloys over 900$ sp circ$C to produce Zr-Al based intermetallics at the metal/ceramic interface.

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Panchula, Martin Lawrence. "Synthesis and sintering of nanocrystalline alumina and aluminum nitride." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85366.

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Cross, Peggi Sue 1960. "The synthesis of aluminum hydrous oxide from aluminum acetylacetonate." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277276.

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A method for the preparation of submicron, monodispersed, spherical particles of aluminum hydrous oxide has been developed. The method consists of the hydrolysis of aluminum acetylacetonate in alcoholic solution by the direct addition of a base at room temperature. The effects of the process parameters including temperature, solvent, type and concentration of base, aluminum acetylacetonate concentration, and stirring time are examined as well as the process reproducibility, particle composition and particle stability. Results obtained have shown that monodispersed particles can be formed with a mean particle diameter of eighty five to two hundred and fifteen nanometers and the mean size is reproducible to within ten percent of the mean diameter. Particles that are redispersed in fresh solvent are stable for at least thirty days. A model is proposed which explains the kinetics of particle growth and the influence of experimental parameters such as temperature, pH, concentration and the solvent on the formation of particles.

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Allen, Susan Marie. "Effect of alumina particle additions of the aging kinetics of 6061 aluminum matrix composites." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA238052.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 1990.
Thesis Advisor(s): Dutta, I. "June 1990." Description based on title screeen viewed on October 15, 2009. DTIC Descriptor(s): Scanning, aging(materials), composite materials, growth(general), thermal stability, phase, particles, aluminum oxides, electrical resistance, kinetics, hardness, metastable state, isotherms, calorimetry, protective treatments, addition, measurement DTIC Indicator(s): Aluminum matrix composites. Author(s) subject terms: Aluminum matrix composites. Includes bibliographical references (p. 54-56). Also available in print.

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Lin, Ching-Te 1967. "Microstructure, texture, and hardness gradients in aluminum diffusion-bonded to aluminum oxide." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50351.

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Poirier, Dominique. "Fabrication of aluminum based nanomaterials." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66642.

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Structural applications in transportation necessitate materials with high specific strength and stiffness. With its low density, aluminum (Al) is an interesting candidate, but further strengthening would be beneficial. In this work, the benefits and limitations of nanoreinforcements for aluminum strengthening has been assessed through the addition of carbon nanotube (CNTs) and nanometric alumina (n-Al2O3) to an aluminum matrix by powder metallurgy. It has been found that mechanical milling can homogeneously disperse n-Al2O3 in aluminum. Furthermore, mechanical milling offers the advantages of strengthening the aluminum powder through grain refinement, cold working, solid solution and precipitation. However, CNTs are damaged by mechanical milling, and their homogeneous dispersion cannot be achieved with a chemical dispersant. Nanocomposite consolidation has presented several challenges as hot pressing resulted in a lack of bonding, grain growth and the formation of Al4C3 from damaged CNTs. Cold spraying of Al2O3/Al has resulted in a porous coating with decreased hardness. The microhardness and compression properties of an Al2O3/Al nanocomposite produced by mechanical milling followed by hot pressing were measured. Comparison with modeled values and literature results indicates that higher experimental yield strength obtained with the addition of n-Al2O3 versus micron size Al2O3 is due to in-situ matrix strengthening. Modeling shows that CNTs offer high potential gains in stiffness due to their high aspect ratio and their high Young modulus. On the other hand, as yield gains associated with the addition of nanoreinforcement are mainly due to matrix strengthening, discontinuous nanocomposites do not benefit from the CNT's exceptional strength. In this case, n-Al2O3 would be selected over CNTs as it is cheaper and more easily dispersed.
Les applications structurales du secteur des transports nécessitent des matériaux avec des résistances mécaniques et des rigidités spécifiques élevées. Avec sa faible densité, l'aluminium s'avère un candidat de choix. Par contre, pour favoriser son utilisation, l'augmentation des propriétés spécifiques est nécessaire.Dans ce projet, le potentiel et les limitations des nanorenforts pour l'augmentation de la résistance mécanique de l'aluminium ont été évalués. Pour ce faire, des composites à matrice d'aluminium renforcés par nanotubes de carbone (CNTs) et alumine nanométrique (n-Al2O3) ont été fabriqués par métallurgie des poudres. Il a été constaté que le broyage mécanique disperse de manière homogène l'alumine nanométrique dans l'aluminium. En plus, le broyage mécanique offre l'avantage de renforcer la matrice d'aluminium par affinement des grains et écrouissage en plus de procurer un durcissement par solution solide et par précipitation. Par contre, les nanotubes de carbone sont endommagés par le broyage et il n'est pas possible d'obtenir une dispersion homogène des nanotubes dans l'aluminium par l'utilisation d'un dispersant chimique.La consolidation des nanocomposites présente aussi de nombreux défis puisque le pressage à chaud ne permet pas un bon frittage, provoque la croissance des grains et mène à la formation de carbures à partir des nanotubes endommagés. La pulvérisation à froid des poudres composites Al2O3/Al a quant à elle produit un revêtement poreux avec une dureté réduite.La microdureté et les propriétés mécaniques en compression du nanocomposite Al2O3/Al produit par broyage mécanique suivi d'un pressage à chaud ont été mesurées. La comparaison de ces résultats avec les valeurs modélisées et celles provenant de la littérature indique que le gain en limite d'élasticité obtenu expérimentalement avec l'addition d'alumine nanom

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Fransson, Christoffer. "Accelerated aging of aluminum alloys." Thesis, Karlstad University, Karlstad University, Karlstad University, Karlstad University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-5041.

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In order to determine storage life for aluminum alloys it is essential to have a good knowledge on the accelerated aging behavior and the mechanical properties that are affected. The selected aluminum alloys are AA2017, AA6082, AA7075 and the study has been focused on their impact toughness and hardness relation to aging beyond peak conditions. To be able to plot the mechanical properties versus aging time and temperature, Differential Scanning Calorimetric runs have been the key to obtain supporting activation energies for a specific transformation. The activation energies have been calculated according to the Kissinger method, plotted in Matlab. Arrhenius correlation has also been applied to predict the natural aging time for long time storage in 30 degrees Celsius. It could be concluded that the results from the mechanical test series show that the constructed Arrhenius 3D method did not meet the expectations to extrapolate constant activation energies down to storage life condition. Scanning electron microscopy together with light optical microscopy analyses show how important it is to apply notches in proper test specimen directions and how precipitates are grown, as it will affect impact toughness and hardness.

An ending discussion is held to explain how mechanical testing progressed and how other external issues affected the master thesis operations.

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Lofstrom, geoff. "Solid Salt Fluxing of Molten Aluminum." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1372269556.

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Gammage, Justin Wilkinson D. S. "Damage in heterogeneous aluminum alloys /." *McMaster only, 2002.

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Hoegh, Harald 1976. "An economic analysis of aluminum sheet production and prospects of aluminum for the automotive unibody." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/67167.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2000.
Includes bibliographical references (p. 48).
In order to lower fuel consumption and reduce emissions, aluminum is being considered as an alternative to steel in large scale production of autobodies. This study evaluates the prospects of aluminum sheets as a cost efficient alternative to steel in autobodies with the unibody design. The study focuses on the processing technologies and alloy selection for aluminum automotive sheets and looks at the impact of these on the total part forming cost of the unibody. Technical cost modeling was used to analyze the costs of traditional direct chill casting and subsequent rolling of aluminum alloy sheet and compared the technology to the alternative continuous casting fabrication method. A change to continuous casting displayed large potential cost savings and was believed to be crucial in order for aluminum to be competitive with steel. A large cost penalty is associated with the alloying and heat treatment of 6xxx series sheet for outer body panels as opposed to 5xxx series sheet for interior panels. Changes in production method for 6xxx series sheet or a replacement by 5xxx series sheet will have large impact on the cost of the autobody. The volatility in the price of aluminum ingot has a critical influence on the price of sheet. Changes in the price level have been shown to be equally critical for the final sheet cost as substantial technical improvements. Recent developments of high strength steel have shown promise for substantial weight reduction in steel automobiles and make the challenge even greater for aluminum as its possible successor.
by Harald Hoegh.
S.B.

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Blander, Alexandre Joel. "Transformation phenomena in superplastic aluminum 7475." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81529.

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The process of superplastic forming in 7475 aluminum alloy was analyzed using orientation imaging microscopy (OIM), x-ray diffraction and scanning electron microscopy (SEM). These techniques were used to determine the effect of the superplastic forming on texture, grain boundary character distribution (GBCD), grain size, residual stress and microstructure at different stages of the deformation of specimens deformed in tension. Results indicate that a microstructure is transformed mainly by the grain boundary sliding process that is responsible for rapid randomization of texture. There is also much evidence for crystallographic slip occurring in conjunction with grain boundary sliding. Accommodation of superplastic flow is linked to increased dislocations density in the lattice. At a threshold level, the dislocation density reaches certain saturation level and the nucleation of voids starts. At this threshold strain, the deformation mechanism is altered and superplastic flow proceeds, however, cavities continue to be produced and coalesce due to the grain boundary sliding process. A precipitate free zone is observed during deformation. This zone is more plastic and presents an orientational difference when compared to the grain interior. It is theorized that this precipitate free zone aids in the accommodation of GBS and plays a role in the cavitation process. The Kernel average misorientation function of OIM was used to indicate the level of strain within the grains to explain the formation of cavities.

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Klinter, Andreas. "Wetting behaviour of aluminum alloys on ceramic substrates and its effect on the stability of aluminum foams." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92344.

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Melnick, Joshua Robert. "Aluminum Nitride Countour Mode Resonators." Thesis, Rochester Institute of Technology, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1591270.

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Resonators are a major component in RF electronic products. They are used in a host of ways to filter radio signals. Modern and Future RF communications have placed high demands on the industry; requiring low power usage, wide array of applications and resistance to noise.

In this thesis, a discussion of the motivation for RF MEMS filters and basic theory is given with an explanation of the concepts of Q factor, piezoelectricity, acoustics theory, the major types of resonators (SAW, BAW, CMR or LAMB), apodization theory and techniques as well as design, simulation of CMR and BAW devices, testing and process development of aluminum nitride by RF reactive sputtering at RIT.

Finite element analysis was performed on a number of factors of aluminum nitride contour mode resonators (CMR) from piezoelectric film thickness, to electrode pitch, electrode thickness and electrode configuration; to understand the effects. First order and second order vibration modes were seen including symmetric S₀, S₁ and antisymmetric A₀, A₁ resonant modes in the pizeoacoustic devices and higher. A series of time dependent video simulations of SAW, BAW and LAMB wave resonators were also performed, perhaps the first of their kind.

The RF reactive sputtering deposition for aluminum nitride was developed at RIT by a fractional factorial experiment with the factors being RF power, nitrogen to argon flow rate ratios, changing the distance of the wafer to the platen from 5 to 4 cm, use of a aluminum, molybdenum or virgin silicon seed layer and chamber pressure. In nearly all cases it was found that an RF power of 1000W is the most important factor contributing to the ⟨002⟩ orientation. The decreasing of the target distance may inhibit a reaction mechanisms in the plasma resulting in a more amorphous deposition. It may be due to the increase in temperature resulting from the higher RF power that promotes the growth of ⟨002⟩ oriented aluminum nitride. A molybdenum seed layer tends to have a stronger ⟨002⟩ peak relative to aluminum and a chamber pressure of 3mT was found to exhibit a deposition that most favors the ⟨002⟩ oriented aluminum nitride.

It was found that molybdenum is not consumed in a wet etch of KOH. Molybdenum is oxidized during photo resist ashing. The Contact Vias were necessarily over retched in order to ensure complete removal of Al-N over the Bottom Electrode.

C-V measurements were done on the aluminum nitride to determine its quality, the measured extensional piezoelectric coefficient d₃₃ is -0.000108716 nm/V, which is -0.108716 pm/V lower than 8pm/V typically reported. The lower piezo electric coefficient measured as compared with typical values, may be due to low film density a result of the high power used in the RF reactive sputtering that was used to heat the platen to a high enough temperature to promote the?002?oriented growth of AlN.

A series of iterations were designed and S11 frequency response measured. The electrode overlap from 25 to 50 to 75μm, it does not appear to have an effect on the resonant frequency, but does increase the amplitude of the response at that die's given frequency. Increasing the anchor width from 5μm to 10μm to 20μm lowers the relative amplitude of the response therefore lowering the Q of the resonator. It may be that the increasingly wide anchor, increases the mechanical resistances within the device and thereby lowers the Q factor of the resonator. Increasing the number of electrodes increases the relative amplitude of the response. Increasing pitch from 5μm to 6μm seems to have a small effect on the resonant frequency of the devices, shifting them from 4.57 to 4.59 GHz. A quality factor was measured, with an anchor width of 5μm, pitch of 5μm, 24 electrodes and an electrode overlap of 75μm had a measured Q value of 98.8.

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King, L. J. "Aligned nanorods of A1PO4-5 within the pores of anodic alumina : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Master of Science with Honours in Chemistry /." ResearchArchive@Victoria e-thesis, 2010. http://hdl.handle.net/10063/1289.

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Sumartha, Yusuf 1972. "Fluidity of rheocast A356 aluminum alloy." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10231.

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Fauré, Philippe L. "Aluminium : production processes and architectural application." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63919.

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Newberg, Carl Edward 1962. "Materials research on metallized aluminum-nitride for microelectronic packaging." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276913.

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The use of aluminum nitride as a substrate material for microelectronics is examined. A brief look at thermal, mechanical, and electrical properties of aluminum nitride show that it is a viable alternative material for this use. A study of the interfaces between aluminum nitride and several thick film pastes (palladium silver conductor, ruthenium oxide resistor, and gold conductor) was performed with optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy. Results of this investigation showed that the contaminants in the substrate material that affect thermal conductivity do not affect the adhesion of the thick film pastes. However, it was found that the lack of certain elements in the binder of the thick film paste could lead to weaker adhesion, and severe degradation of the thick film's adhesion during thermal cycling.

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Jansen, Ann Marie. "The mechanical properties and microstructures of aluminum containing 25 vol.% of 0.3[mu]m alumina particles." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/42809.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
In title on t.p., "[mu]" is the lower-case Greek letter.
Includes bibliographical references (leaves 175-183).
by Ann Marie Jansen.
Ph.D.

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Huang, Ting-Yun Sasha. "Stability of nanostructured : amorphous aluminum-manganese alloys." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104107.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 113-122).
Nanocrystalline alloys have attracted interest for decades because of their improved mechanical strength without sacrificing ductility, but structural stability has always been an issue. In this work, bulk aluminum-manganese (Al-Mn) nanocrystalline alloys have been synthesized using room temperature ionic liquid electrodeposition, by which various nanostructures and dual-phase structures can be created by controlling the Mn solute incorporation level. The manganese exhibits grain boundary segregation in the Al-Mn solid solution in the as-deposited condition, which contributes to enhanced stability of the nanostructure. The grain boundary properties of the nanostructured alloys were studied via three dimensional atom probe tomography and aberration-corrected scanning electron microscopy. The segregation energies were calculated based on the experimental results and compared with the values calculated from a thermodynamic-based segregation model. Upon heating of the nanostructured and dual-phase alloys, a variety of complex phase transformations occur. A combination of X-ray diffraction, transmission electron microscopy, as well as differential scanning calorimetry were employed to understand the phase transformation mechanisms and grain growth processes. A Johnson-Mehl-Avrami-Kolmogorov analytical model was proposed as a descriptive method to explain the phase transformation sequence. Using the parameters extracted from the analytical model, predictive time-temperature transformation diagrams were constructed. The stability region of the alloy in time-temperature space is thus established, providing a simple way to evaluate nanostructure stability.
by Ting-Yun Sasha Huang.
Ph. D.

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Keles, Ozgur. "Production And Characterization Of Alumina Fiber Reinforced Squeeze Cast Aluminum Alloy Matrix Composites." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609726/index.pdf.

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The aim of the present study was to investigate the effects of different levels of Saffil alumina fiber addition, magnesium content in aluminum alloy matrix and casting temperature on the mechanical behavior, microstructure and physical properties of short fiber reinforced aluminum matrix composites. The main alloying element silicon was kept constant at 10 wt%. Magnesium contents were selected as 0.3 wt% and 1 wt%. Saffil alumina fiber preforms varied from 10 to 30 vol%. The casting temperatures were fixed at 750 °
C and 800 °
C. Micro porosity was present at the fiber-fiber interactions. Closed porosity of the composites increased when fiber vol% increased, however, variation in casting temperature and magnesium content in matrix did not have influence on porosity. Hardness of the composites was enhanced with increasing fiber vol%, magnesium content in matrix and decreasing casting temperature. Alignment of fibers within the composite had an influence on hardness
when fibers were aligned perpendicular to the surface, composites exhibited higher hardness. The highest hardness values obtained from surfaces parallel and vertical to fiber orientation were 155.6 Brinell hardness and 180.2 Brinell hardness for AlSi10Mg1 matrix 30 vol% alumina fiber reinforced composite cast at 800 °
C and at 750 °
C, respectively. 30 vol% Saffil alumina fiber reinforced AlSi10Mg0.3 matrix composite cast at 750 °
C showed the highest flexural strength which is 548 MPa. Critical fiber content was found as 20 vol% for all composites.

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Ozbakir, Erol. "Development of aluminum alloys for diesel-engine applications." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32568.

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Weight reduction in vehicles has important benefits of fuel economy and reduction in greenhouse gas emissions as well as improved vehicle performance. The current material for the diesel-engine block/head is mostly ductile iron and replacing it with aluminum alloys would result in very effective weight reduction (30-40%). Current commercial cast aluminum alloys, however, soften at engine operating temperatures exceeding 200°C and would cause early fracture in the diesel engine. Two new alloys derived from the commercial alloy (A356) are described in terms of microstructure, creep, aging behavior and tensile properties at elevated temperatures. The alloy containing both peritectic (Cr, Zr and Mn) and age hardenable elements (Cu and Mg) shows superior aging response at 200°C (for 200 hours) and creep properties at 300°C (for 300 hours). Interestingly, the alloy has better tensile strength (161MPa) at 250°C with adequate ductility compared to the current engine alloys, A356 and A356+Cu. The improvement in mechanical properties is attributed to the newly formed thermally stable fine precipitates (ε-AlZrSi, α-AlCrMnFeSi…) inside the α-Al dendrites.
La diminution du poids des véhicules résulte dans l'apport important de bénéfices au niveau de l'économie d'essence, la réduction des gaz à effets de serre aussi bien que l'amélioration du rendement du véhicule. Le matériau principal présentement utilisé pour la fabrication de la tête et du bloc moteur est la fonte ductile. Le remplacement de la fonte par des alliages d'aluminium va conduire vèrs une diminution (30-40%) significative du poids. Les alliages d'aluminium de coulée actuels laissent voir dans le temps un ramolissement du métal lorsque les températures d'opération du moteur exèdent 200ºC. Ce phénomène provoquera à plus ou moins brève échéance un bris prématuré du moteur diésel. Deux nouveaux alliages développés à partir de l'alliage commercial A356 sont présentés dans les termes suivants : microstructure, fluage, comportement au vieillissement et propriétés de traction à des températures élevées. L'alliage contenant les deux groupes d'éléments soit péritectiques (Cr, Zr et Mn) dans un premier temps et pour le durcissement structural par le vieillissement (Cu et Mg) dans un second temps, démontre une réponse supérieure au vieillissement à la température de 200ºC pour une période de 200 heures et de meilleures propriétés de fluage à la température de 300ºC pour une période de 300 heures. De façon plus intéressant, l'alliage possède de meilleures propriétés de traction (161MPa) à 250ºC avec une ductilité adéquate comparativement aux alliages de bloc moteur fabriqués à partir des alliages A356 et A356 + Cu. L'amélioration des propriétés mécaniques est ainsi attribuable aux nouveaux précipit

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Park, Conrad. "Mechanical Performance and Structure-Property Relations in6061B Aluminum Metal Matrix Composites." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1547842396716777.

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Johansson, Anders. "Template-Based fabrication of Nanostructured Materials." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7364.

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Delbin, Daniel. "Estudo da viabilidade de produção de esponjas da liga A2011 a partir do estado semi-solido." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263622.

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Orientador: Maria Helena Robert
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-11-08T18:37:47Z (GMT). No. of bitstreams: 1 Delbin_Daniel_M.pdf: 8551361 bytes, checksum: 770e9d00eeb959cc6e40cf3f314faa4e (MD5) Previous issue date: 2006
Resumo: Neste trabalho é estudada a viabilidade de produção de esponjas metálicas pela conformação de pasta tixotrópica da liga A2011, sobre camada de agente bloqueador (NaCl) posteriormente removido para formação da porosidade. Investiga-se a influência da temperatura de tratamento térmico, para obtenção da pasta semi-sólida, e da granulometria do agente bloqueador, na estrutura formada do material celular (aspecto geral, caracterização qualitativa e quantitativa dos poros, microestrutura da parede celular e densidade) e nas características de processo (forças de tixoforjamento e capacidade de penetração da pasta). São produzidos cilindros de material poroso metálico tipo sanduíche, compostos de camada porosa entre camadas maciças da liga, com três diferentes classes de porosidade: fina, média e grosseira. As esponjas foram submetidas à tomografia computadorizada e à análise metalográfica para sua caracterização estrutural. Os resultados obtidos mostram a viabilidade de obtenção de esponjas metálicas utilizando a tecnologia de semi-sólidos e o tipo de bloqueador utilizado. O sucesso do processo depende da fração líquida presente na pasta metálica tixotrópica, reduzida fração líquida pode resultar em incompleta infiltração e compressão das partículas do agente bloqueador. Nas condições analisadas a granulometria do agente bloqueador não teve influência sensível na qualidade do produto. A densidade do material poroso aumenta com o aumento da temperatura de processo, devido ao aumento da espessura de paredes metálicas na estrutura porosa
Abstract: The work analyses the possibility of the production of cellular material by pressing the A2011 alloy in the thixotropic semi-solid state, into a space holder pre-form. Space holder particles used are NaCl, which are removed from the product after the forming operation, resulting the porous material. It is investigated the influence of the thixoforming temperature and the size of space holder particles, in the structure of the obtained porous material (general aspect, quantitative and qualitative characterization of porosity, microstructure of cell walls and density of the product), as well as in the processing characteristics (required forces for infiltration, penetration ability of the slurry in the salt pre-form). Cylindrical samples, sandwich type, with a porous layer inserted between layers of compact alloy are produced, presenting three different ranges of porosity. The cellular material obtained contains opened porosity, being characterized as sponge. Products were analyzed by tomography and metallographic techniques. Results show that the proposed process is able to produce acceptable porous material, with a simple and low cost technique. The quality of the product depends rather on the processing temperature than on the size of space holder particles. Low liquid fraction in the thixotropic slurry can lead to incomplete infiltration and deformation of the pre-form. In the analyzed conditions, influence of the size of space holder particles could be observed neither in the processing ability nor in the quality of the product. Density of produced porous material increases as processing temperature increases, due to the increase of thickness of cell walls
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica

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Akpan, Edem T. Gogot︠s︡i I︠U︡ G. "Viscoelastic toughening of refractory ceramics /." Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/284.

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Diewwanit, Ittipon. "Semi-solid processing of hypereutectic aluminum-silicon alloys." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10860.

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San, Marchi Christopher William. "Processing of aluminum-nickel intermetallics by reactive infiltration." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43369.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
Includes bibliographical references (p. 107-111).
by Christopher William San Marchi.
Ph.D.

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28

Joseph, Carolyn M. "Detection of Floating Grains in DC Aluminum Casting." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/109015.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 42-44).
Free-moving "floating" grains have been linked to macrosegregation in direct-chill (DC) aluminum castings. The presence of these grains in the sump of a solidifying ingot has been acknowledged based on measurements of cast microstructures and by recent work using a turbulent jet to suspend solute-poor grains and minimize macrosegregation.1,2 Experiments in this study were designed to sample grains from the mushy region of two ingots, one cast by the standard method and another stirred with a turbulent jet. Measurements of floating grain size, concentration, morphology, and chemical composition are reported. The observations from the standard ingot offer a point of comparison for floating grain theories and casting models. The measurements from the stirred ingot show how the turbulent jet modifies the distribution, concentration and morphology of the floating grains.
by Carolyn M. Joseph.
S.M.

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Wagstaff, Samuel Robert. "Jet processing of direct chill cast aluminum ingots." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108965.

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Thesis: Sc. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Macrosegregation of solute elements during casting operations has been a subject of observation, discussion, and research for several hundred years. The unique casting conditions found in the Direct-Chill aluminum casting process can lead to significant accumulation and depletion of solute elements throughout the cast product. In particular, the center of ingots are generally characterized by a depletion of up to 20 % of solute elements. In this investigation we confirm the dominant role mobile, solute-depleted grains play on magrosegregation along ingot centerlines. We propose that avalanche events drive the grains from the solidification front to the ingot center. In order to demonstrate and control this preferential settling, we propose the use of a turbulent jet to re-suspend the avalanching grains. An analytical expression is derived in order to optimize the dimension of the jet with the goal of minimizing centerline segregation. We then performed a series of experiments in order to validate the analytical expression across ingot dimensions and alloy families. Our experiments indicate that the use of a properly sized turbulent jet can reduce the degree of centerline segregation by up to 70% from standard conditions.
by Samuel Robert Wagstaff.
Sc. D.

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Hohmann, Brian P. (Brian Patrick). "Mechanical behavior of dip-brazed aluminum sandwich panels." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38585.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2007.
"February 2007." Vita.
Includes bibliographical references (leaves 158-160).
An experimental study was carried out to determine the mechanical behavior of sandwich panels containing cellular cores of varying shape. Compression and four point bend tests were performed on sandwich panels with square and triangular honeycomb cores. These honeycombs were made of perforated aluminum sheet of repeating diamond and hexagonal patterns. The sandwich panel assemblies were joined via dip brazing. Defects were introduced into some panels to quantify the effect on strength and stiffness. Hybrid sandwich panels, consisting of foam material in the void spaces of the square and triangular cells were evaluated for the effect on the defect tolerance of the structures. The results showed that sandwich panels with diamond shaped cores had compressive strengths approximately four times greater than hexagonal shaped cores. In four point bending the diamond cores were approximately twice as stiff as cores made from hexagonal patterned sheet. The introduction of defects lowered strength by about 30% for diamond cores in compression, and about 15% for hexagonal cores. In four point bending this strength reduction was not as significant due to shear stresses damaging periodicity at a faster rate than in compression.
(cont.) The use of foam within the cells resulted in higher absolute peak compression and flexure loads, however the Load/Density ratios demonstrated cases where the added weight of the foam did not result in a better panel. A difference of nearly an order of magnitude between the highest and lowest compressive and flexure loads is evident when the presence of defects and foam are taken into account.
by Brian P. Hohmann.
S.M.

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31

Oh, Se-Yong. "Wetting of ceramic particulates with liquid aluminum alloys." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14643.

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Fraser, Andrew. "Mesoscale behavior of an aluminum-manganese dioxide-epoxy mixture under shock loading: from milli to nano-sized aluminum particles." [Milwaukee, Wis.] : e-Publications@Marquette, 2009. http://epublications.marquette.edu/theses_open/7.

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Cloutier, Caroline. "The wear resistance of commercially produced aluminum oxide ceramics /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31046.

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High hardness, fracture toughness, modulus of rupture and fine grain size are material properties that are desired for components employed in aggressive wear environments. Since aluminum oxide offers such properties, this type of material is often selected for applications that demand wear resistance. Aluminum oxide materials commercially produced at Superior Technical Ceramics were investigated to find a correlation between their mechanical properties and wear resistant performance. A pin-on-disc apparatus and a tumbling test were employed to determine the relative difference in wear between different alumina compositions. The selected 88%, 96%, 98% purple, 98% alumina and zirconia toughened alumina were subjected to four different wear tests in order to determine their wear behavior in each system. The objective was to characterize the compositions according to their mechanical properties and to establish a wear material selection guide for Superior Technical Ceramics. (Abstract shortened by UMI.)

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34

Lemieux, Stéphane. "Thermal expansion study of particulate reinforced aluminum matrix composite materials." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20505.

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The thermal expansion behavior of Duralcan particle reinforced composite materials was investigated. Initially, the temperature dependence of the CTE of Al-Si alloy containing SiC reinforcement particles ranging from 10 to 40% in volume was experimentally examined and compared with standard theoretical model predictions. In addition, the effects of reinforcement volume fraction and nature of the composite constituents during thermal cycling between 25 and 350ºC were determined for Al-Si alloy containing between 10 and 40% SiC particles and Al alloy having 40% alumina in volume. Accurate experimental CTE measurements were made using a high precision Thermomechanical Analyzer system. Silicon carbide reinforced composite average CTE values were bounded by two elastic CTE theoretical models consisting of Schapery and Kerner predictions over the 25--350ºC interval for reinforcement volume fractions between 10 and 40%. The CTE mismatch between the particles and the matrix does not appear to be the only factor influencing the expansion response of the composites. Indeed, the nature of the composite constituents also plays an important role by influencing the ductility and bonding of the particle-matrix interface.

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Lemieux, Stephane. "Thermal expansion study of particulate reinforced aluminum matrix composite materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ44021.pdf.

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36

Xu, Yifan. "Ultrasonic Sealing of Aluminum Foil Based Laminate Food Packaging Materials." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1363860721.

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Ridgeway, Colin D. "Integrated Computational Materials Engineering (ICME) of Aluminum Solidification and Casting." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587378327014374.

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38

Vazquez, Isaura 1960. "On aluminum grain boundary structure and segregation." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291693.

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The effect of an alloying agent, such as Mg, on Al grain boundary microstructure and chemistry was investigated. HREM measurements on an Al-5% Mg Σ = 5 (310) grain boundary showed Al grain boundary structure modification because of the presence of Mg. Chemical analysis, through TEM/STEM EDS of Al-2% Mg alloy, indicated the possibility of Mg segregation at Al grain boundaries, although this should be further investigated. An experiment is proposed to determine the change in grain boundary torque with impurity chemical potential. Molecular dynamic simulations of the effect of segregated vacancies was also studied. This study showed that grain boundaries act as sinks for vacancies. In addition, the presence of vacancies caused a relocation of the grain boundary plane, through a sliding-migration, or atomic restructuring of the boundary depending upon the vacancy distribution.

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39

Kharal, Shankar Prasad. "Modelling Sensitization Dynamics in 5xxx Series Aluminum Alloys." Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10682751.

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This thesis addresses the use of the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model for better understanding of kinetics of crystallization of the beta-phase in sensitized aluminum alloys. Three acoustic parameters: longitudinal velocity, transverse velocity, and attenuation coefficient for longitudinal waves, are modeled as a function of time as the beta-phase volume fraction increases. The acoustic parameters were previously measured in the same laboratory with two ultrasonic techniques, Resonant Ultrasound Spectroscopy (RUS) and Pulse Echo (PE), on sensitized samples of Al5083-H116 and Al5456-H116. In this investigation, a comparative study of beta-phase kinetics in terms of the phase transformation rate constant, k, and Avrami exponent, n, was performed on the three acoustic parameters, to understand their evolution with the degree of sensitization. The values of n indicate a combination of 2D to 1D growth at the grain boundaries and at their intersections. The values of k grow non-linearly with the heat-treatment temperature; k is higher for the attenuation coefficient as compared with that for velocity.

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40

Gustafsson, Sofia. "Corrosion properties of aluminium alloys and surface treated alloys in tap water." Thesis, Uppsala universitet, Institutionen för materialkemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157527.

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The aim of this thesis is to obtain a basic knowledge of the factors that affect corrosion of aluminium in tap water for different kinds of applications like water pipes for tap water, solar systems, HVAC&R-applications (like fan coil units on chillers) and heat sinks for electronic or industrial applications. Open systems are used in some applications and closed systems in others. There is a clear difference in the corrosion behaviour of these two systems. The main reasons for this difference are that the content of oxygen differs between the two systems and also that inhibitors can be used in closed systems to hinder corrosion. In this thesis focus will be on corrosion in open systems. The corrosion properties in tap water for different alloys of aluminium and different surface treatments have been examined. The influences on corrosion of the oxygen content in water and the iron content in aluminium alloys have been investigated. The corrosion properties of an aluminium alloy in deionised water have also been examined.

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Dixon, Robert Gordon. "Microstructure/property relationships for carbon fiber reinforced aluminum alloys." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15127.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: leaves 104-107.
by Robert Gordon Dixon, Jr.
M.S.

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42

Li, Preston Pui-Chuen. "Strategies for aluminum recycling : insights from material system optimization." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33611.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2005.
Includes bibliographical references (p. 181-185).
The dramatic increase in aluminum consumption over the past decades necessitates a societal effort to recycle and reuse these materials to promote true sustainability and energy savings in aluminum production. However, the path towards this goal is full of challenges which lead to inefficiencies in the usage of secondary materials. These frictions are due to (i) rapidly changing consumption patterns, (ii) compositional incompatibility in scrap streams and (iii) incomplete information in the decision making process around scrap consumption. This thesis tackles these inefficiencies by developing optimization-based decision tools and modeling techniques for the assessment of sorting technologies and scrap management from procurement to production. In the course of managing and accounting for the aforementioned variability and uncertainties in the material system inputs, the goal is to present cost-effective strategies to increase scrap consumption under applicable context of different operating environment in aluminum production. These decision tools also aim to foster a fundamental shift in decision-making behavior to factor in uncertainties into the scrap management process.
(cont.) A sorting algorithm with an arbitrary number of output streams is created as a guide to quantify the effects of wrought and cast recovery rates, sorting cost, scrap content, and product mix on sorting technologies application and development. In collaboration with Norsk Hydro Aluminum, an evaluation of wrought-versus-cast sorting technology is undertaken. For a reasonable range of sorter recovery rates and costs, the process leads to overall cost savings and increase in scrap consumption. Unlike cost savings and scrap consumption, however, the sorter utilization rate does not increase monotonically with improvements in recovery rates. Furthermore, under limited scrap supplies, not all products benefited in increased scrap consumption with sorting. Stochastic optimization techniques are introduced to address demand and scrap compositions uncertainties faced by different decision-makers along the aluminum production chain. With the idea of recourse and scrap net residual value, increased scrap purchase and usage were determined to be an effective hedge against adverse demand swings. Traditional forecast-based deterministic decision tools were found to be too costly and conservative in scrap usage on average.
(cont.) At the operator level, stochastic modeling draws relevance in its ability to link production tolerance level for compositional variance to the underlying compositional uncertainties in scrap materials. The technique also supports diversification in scrap sources as a way to mitigate compositional variance in product scrap usage. Overall these models and methodologies target various scrap usage inefficiencies in the aluminum production chain. Their application and associated insights can bring society one step closer towards sustainable development, not only in aluminum, but potentially for other light metals as well.
by Preston Pui-Chuen Li.
Ph.D.

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43

Oh, Jihun. "Porous anodic aluminum oxide scaffolds; formation mechanisms and applications." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59709.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Nanoporous anodic aluminium oxide (AAO) can be created with pores that self-assemble into ordered configurations. Nanostructured metal oxides have proven to be very useful as scaffolds for growth of nanowires and nanotubes with tunable diameters and with tight diameter distributions. For 50 years, field-assisted dissolution of the oxide has been cited as the mechanism that leads to pore formation in alumina, and by analogy, porous anodic TiO₂ and other functional metal oxides. We show that field-assisted dissolution models are consistent with the observed dependence of the Al₂O₃ dissolution rate on the electric field, as well as the existence of a critical field for pore initiation. However, we further show that the well-known ordered porous structure, which has a significantly different length scale, does not result from a field-induced instability, but is instead the result of a strain-induced instability with forced plastic deformation and flow of the oxide during further anodization. We demonstrate that these pore generation mechanisms can be controlled independently, even when they co-exist, by controlling the electric field across the oxide as well as the anodization conditions. We also show that mechanical confinement results in a dendritic pore structure. Through interpretation of these results we develop a generalized mechanism for ordered pore formation in AAO in analogy with cellular solidification. In addition, we report on abnormal behavior in anodic oxidation of Al in mechanically confined structures for formation of horizontal nanoporous anodic alumina oxide, H-AAO. Instead of smooth pore walls, periodic dendrite inner pore structures form, the growth rate is suppressed to 5 % of its value during bulk anodization under the same conditions, and a steady-state is never reached. These anomalies associated with formation of H-AAO originate from suppressed volume expansion and plastic flow of Al₂O₃ confined by the SiO₂ hard mask. By determining new anodization conditions leading to zero volume expansion, dendritic H-AAO can be avoided and kinetic retardation can be minimized. A new method for perforation of the AAO barrier layer has been developed, based on anodization of Al/W bilayer films on substrates. When Al/W bilayer films are anodized and pores approach the Al/W interface, tungsten oxide forms and penetrates the alumina barrier oxide, in part, due to enhanced plasticity of the alumina layer. By selectively etching the tungsten oxide, the barrier oxide can be removed and the base of the pores opened, without etching of the AAO. Finally, we further refined the selective barrier perforation process using the W interlayer to develop a methodology for fabrication of through-pore AAO scaffolds on any conducting substrate (AS) by anodizing an Al/W/AS tri-layer. Structural and kinetic study of the WO₃ extrusion revealed that the anodization of W consumes a fixed thickness of the W layer in acidic electrolytes under specific anodization conditions. Based on this study, the optimum thickness of the W interlayer in the Al/W/Au tri-layer was measured for various anodization conditions. Through-pore AAOs were fabricated on Au layers with exposure of the surface at the base of the pores, using the optimum W thickness without a violent O₂ evolution reaction and without changing the pore diameters. With scaffolds made using this methodology, vertically-aligned free-standing Au and Pt nanowires with diameters ranging from about 12 nm to about 120 nm were grown by electrodeposition on a gold substrate.
by Jihun Oh.
Ph.D.

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CHANDRASEKARAN, SENTHILKUMAR. "ELECTRODEPOSITION OF BIS-SILANE FOR THE PRETREATMENT OF ALUMINUM ALLOYS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155647381.

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Jones, Kimberly A. "The creep behavior of aluminum alloy 8009." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19630.

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Ng, King-yeung. "An investigation of the deformation of anodic aluminium oxide nano-honeycomb during nanoindentation." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42841240.

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Duvenage, Sarel. "The feasibility of diamond-alumina as a wear resistant material." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-01122007-151002/.

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Tran, Duc Khanh. "Experimental and numerical study of crack bridging in polycrystalline ceramics at room and elevated temperatures /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/7042.

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Papageorge, Marc Vasilios. "Characterization of metal/ceramic interfaces on aluminum nitride." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/9352.

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Liu, Li. "Évaluation de la propreté des alliages d'aluminium de fonderie A356.2 et C357 à l'aide de la technique PoDFA /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1997. http://theses.uqac.ca.

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Dissertations / Theses on the topic 'Aluminum Materials'

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