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Dissertations / Theses on the topic 'Aluminum crystals'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

Evans, Herbert Elgin 1962. "Preparation of high-purity aluminum bicrystals." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277076.

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The preparation of bicrystal specimens of high interfacial purity and accurately controlled mismatch of orientation between grains with a specific boundary orientation are critical for fundamental studies of the structure and properties of grain boundaries. A method was developed for routinely producing high-purity aluminum bicrystals of desired mismatch and boundary orientation. A strain annealing technique was used for making large single crystals. The orientation, structural perfection, and chemical purity of the seeds were characterized, then the seeds were joined by using an electron beam

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2

Liu, Bei. "Growth of aluminum nitrade bulk crystals by sublimation /." Search for this dissertation online, 2004. http://wwwlib.umi.com/cr/ksu/main.

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3

Xiao, Guanghao. "Grain boundary motion in aluminum bicrystals /." View online version; access limited to Brown University users, 2005. http://wwwlib.umi.com/dissertations/fullcit/3174697.

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4

Broussell, Isabelle. "Optical properties of alpha-zinc aluminum sulfide:chromium single crystals." Thesis, University of Ottawa (Canada), 1998. http://hdl.handle.net/10393/4514.

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The optical properties of the chromium doped spinel type semiconductor $\alpha$-$\rm ZnAl\sb2S\sb4$ have been examined over the temperature range 2-540K. From extrinsic absorption and photoluminescence spectra the transitions between the ground state $\rm\sp4A\sb{2g}$ and the excited levels $\rm\sp2E\sb{g}\ (R\sb1$ and R$\rm\sb2),\ \sp2T\sb{2g},\ \sp4T\sb{2g}$ and $\rm\sp4T\sb{1g}$ of the Cr$\sp{3+}$ ions were observed. A fit of the measured temperature dependence of the PL decay, using a four level model, yielded the lifetimes of the $\rm\sp2E\sb{g}\ (R\sb1$ and R$\sb2)$ and $\rm\sp4T\sb{2g}$

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5

Yasuda, Mitsuhiro. "Pitting corrosion and intergranular corrosion of Al and Al-Cu alloy single crystals and bicrystals." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29221.

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Single crystals and bicrystals have been used to study pitting corrosion and intergranular corrosion of Al and Al-Cu alloys in 0.5M NaCl solution. The critical pitting potential and pit density were examined as a function of a number of factors. These included crystallographic orientation; the bulk solution chemistry including CI- concentration, NO₃- addition and pH; the effect of Cu alloying; and the effects of homogenizing and aging on the alloy crystals. The susceptibility for pitting corrosion was found to depend on crystallographic orientation in pure Al with {111} showing maximum pitti

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6

Venz, Gary Jon. "Hot shock compaction of nanocrystalline alumina." Thesis, Queensland University of Technology, 2002.

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7

Ng, Kwok-sing. "Plastic deformation of aluminium micro-specimens." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B4175802X.

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8

Hutt, James. "The origin of equiaxed crystals and the grain size transition in aluminium-silicon alloys /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16244.pdf.

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9

Ng, Kwok-sing, and 吳國勝. "Plastic deformation of aluminium micro-specimens." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B4175802X.

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10

Wu, Peitsen. "Development of a novel growth method for AｌN bulk single crystals using elemental aluminum and nitrogen gas". 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/202716.

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11

Vailhe, Christophe N. P. "Planar fault energies and dislocation core spreadings in B2 NiAl /." This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12172008-063647/.

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12

Mayeur, Jason R. "Three Dimensional Modeling of Ti-Al Alloys with Application to Attachment Fatigue." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4923.

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The increasing use of alpha/beta Ti-Al alloys in critical aircraft gas turbine engine and airframe applications necessitates the further development of physically-based constitutive models that account for their complex microdeformation mechanisms. Alpha/beta Ti-Al alloys are dual-phase in nature consisting of a mixture of hcp (alpha) and bcc (beta) crystal structures, which through variation in alloying elements and/or processing techniques can be produced in a wide range of microstructural compositions and morphologies. A constitutive model for these materials should address the various so

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13

Henkelman, Graeme. "Methods for calculating rates of transitions with application to catalysis and crystal growth /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/8557.

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14

Farber, Boris Yarovlevick. "Dislocation velocities and dislocation structure in cubic zirconia and sapphire (alpha-aluminum oxide) single crystals." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1061555653.

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15

Zhang, Ming. "Crystal plasticity modeling of Ti-6Al-4V and its application in cyclic and fretting fatigue analysis." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22669.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: David. L. McDowell; Committee Member: Min Zhou; Committee Member: Naresh N. Thadhani; Committee Member: Rami M. Haj-Ali; Committee Member: Richard W. Neu.

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16

Vailhé, Christophe N. P. "Planar fault energies and dislocation core spreadings in B2 NiAl." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/46303.

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The lack of ductility of the B2 NiAl alloy stands in the way of promising applications. In an effort to understand the dislocation behavior, computer simulation of the planar faults involved in the core spreadings of <100> and <111> dislocations was carried out. Seven γ-surfaces were computed for different crystallographic planes ({110}, {112}, {123}, {210}, {100}, {111} and {122}). Stable APB's are observed in the {110} and {112} planes but they are deviated from the exact 1/2a<111> position. No other stable planar fault was observed. The dislocation core spreadings are explained by the energ

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17

Colbaugh, Katherine E. "Czochralski Growth of Doped Yttrium Aluminum Garnet (Y3Al5O12) Crystals and Oxygen Tracer Diffusion Analysis by ToF-SIMS and LEAP." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1429182946.

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18

Lu, Peng. "Sublimation growth of ALN bulk crystals and high-speed CVD growth of SiC epilayers, and their characterization." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/242.

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19

Li, Peng. "Innovative process solutions towards recycling of salt cake from secondary aluminum smelting." Doctoral thesis, KTH, Materialens processvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101074.

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To offer better solutions for the recycling of salt cake from secondary aluminum melting, several innovative investigations were carried out based on hydrometallurgical and pyrometallurgical views. Thermal diffusivity measurements as a function of temperature on salts-Al composites having various compositions (0, 2, 4, 6, 8, 10, 12wt pct metallic Al) were carried out. Its attempt to derive theoretical relationships between aluminium contents in the salt-Al composites and the thermal conductivities so that these would serve as calibration curves for industrial samples taken out from secondary a

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20

Downs, Robert T. "A study of the mean-square displacement amplitudes of T and O atoms in framework silicates and aluminosilicates: evidence for rigid TO bonds, order, disorder, twinning and stacking faults in crystals." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/45947.

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<p>The mean-square displacement amplitudes (MSDA) of the tetrahedral cations Si and Al are compared to the MSDA of their coordinated O atoms in framework silica polymorphs and aluminosilicate structures. Criteria are established which indicate order, structural disorder or substitutional disorder in a framework crystal.</p><br>Master of Science

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21

Neuburger, Monica Louise. "Dynamics of gas-surface reactions on Al(111) and Si(100) /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3055807.

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22

Winkelman, Graham B. "Precipitation at dislocations in Al-Cu-Mg alloys." Monash University, School of Physics and Materials Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9581.

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23

Mushait, A.-N. "Electron spin resonance studies of doped alumina and aluminium nitride." Thesis, Durham University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381946.

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24

VIDAL, AUGUSTO T. "Sintese e crescimento de cristais fluoretos dopados com terras raras: LiCAF:Er e BLF:TR (TR = Yb sup(3+), Ce sup(3+), Nd sup(3+))." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10970.

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Made available in DSpace on 2014-10-09T12:46:16Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:01:47Z (GMT). No. of bitstreams: 1 07973.pdf: 3168450 bytes, checksum: 8bf87743d796e20893798cadfbfad208 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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25

Alankar, Alankar. "Development of a 3D microstructure sensitive crystal plasticity model for aluminum." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/A_Alankar_020910.pdf.

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26

Champory, Romain. "Cellules solaires silicium ultra-minces nanostructurées : conception électro-optique et développement technologique." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC057/document.

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Les cellules photovoltaïques en couches minces de silicium cristallin sont des candidates prometteuses pour les développements futurs de l’industrie photovoltaïque, au travers des réductions de coûts attendues et des applications dans les modules souples. Pour devenir compétitive, la filière des couches minces de silicium monocristallin doit se différencier des filières classiques. Elle est donc généralement basée sur l’épitaxie de couches de haute qualité puis sur le transfert de ces couches vers un support mécanique pour terminer la fabrication de la cellule et réutiliser le premier substrat

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27

Nehari, Abdeldjelil. "Étude et caractérisation de la synthèse de milli-billes d’alumine alpha et de la cristallogenèse du saphir pur et dopé titane (Ti3+)." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10334.

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Ce travail est consacré à l’étude de la croissance cristalline du saphir non dopé et dopé titane (Ti3+). Pour faire croître des cristaux ayant des performances optimisées, il est indispensable de maitriser l’alumine (Al2O3) de départ. Toute contamination de la charge initiale à fondre, dégrade l’état stationnaire de croissance, entraîne la propagation de défauts cristallins, provoque la corrosion des creusets, en particulier en molybdène, et affecte les propriétés physico-chimiques, optiques et laser du cristal. Dans la première partie de ce travail, un nouveau procédé industriel de synthèse d

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28

Kodumuri, Pradeep. "IN-SITU GROWTH OF POROUS ALUMINO-SILICATES AND FABRICATION OF NANO-POROUS MEMBRANES." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1243304850.

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29

Aslam-Malik, Alexander. "Decomposition in aluminium alloys : diffuse scattering and crystal modelling /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11029.

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30

Antunes, Maria Lúcia Pereira. "Estudo de Formação e Caracterização de Hidróxidos de Alumínio por Métodos Óptico-Eletrônicos." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-03102012-160238/.

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Nesta tese foram sintetizadas nove amostras de hidróxido de alumínio, a partir da reação de folhas de alumínio amalgamado em diversos meios reagentes. Esses hidróxidos foram caracterizados por microscopia eletrônica de transmissão, difração eletrônica de varredura e difração de raios-X. A caracterização permitiu descrever a morfologia dos cristais obtidos e identificar rotas novas de preparo de hidróxidos de alumínio. Sendo elas: em meio metanol foi sintetizada gibsita (com alteração em seu hábito cristalino); em meio etanol foram sintetizadas misturas de hidróxidos de alumínio (à concentraç

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31

Lidke, Michael Charles 1954. "Electrical trimming of diffused single crystal silicon resistors using aluminum/silicon alloying." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277972.

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Electrical trim techniques for reducing the value of a trimmable single crystal silicon resistor (trimistor) are presented. Computer-controlled current pulses are used to incrementally decrease the value of the trimistor through metal/silicon alloying. Variations of both single and multipulse current pulses are investigated. Physical mechanisms, based on electron microscopy of trimistors trimmed under various conditions, are hypothesized to explain the observed trim behavior. Threshold currents are dependent on the initial value of the resistor, the applied current density and the trim method.

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32

Totemeier, Terry Craig. "Fatigue of an aluminium coated single crystal nickel-base Superalloy." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337308.

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33

Bennett, Ian John. "Development and evaluation of alumina calcination." Thesis, University of Bath, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340929.

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This thesis focuses on a number of aspects governing the transformation of gibbsite, via intermediate phases, to a-alumina. These aspects include the size and morphology of the gibbsite grains, the influence of additions of foreign elements, the effect of a mechanical treatment of the gibbsite prior to calcination, and combinations of these factors. The materials were characterisedb y scanninge lectron microscopy, X-ray diffraction and surfacea rea measurementsF. or someo f the calcined materials an attempt was made to sinter the powders to a dense body to investigate if any of the treatments

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34

Du, Li. "Bulk crystal growth, characterization and thermodynamic analysis of aluminum nitride and related nitrides." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/8625.

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Doctor of Philosophy<br>Department of Chemical Engineering<br>James H. Edgar<br>The sublimation recondensation crystal growth of aluminum nitride, titanium nitride, and yttrium nitride were explored experimentally and theoretically. Single crystals of these nitrides are potentially suitable as substrates for AlGaInN epitaxial layers, which are employed in ultraviolet optoelectronics including UV light-emitting diodes and laser diodes, and high power high frequency electronic device applications. A thermodynamic analysis was applied to the sublimation crystal growth of aluminum nitride to

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35

Kern, Paul Calvin. "Improvements to the computational pipeline in crystal plasticity estimates of high cycle fatigue of microstructures." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55070.

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The objective of this work is to provide various improvements to the modeling and uncertainty quantification of fatigue lives of materials as understood via simulation of crystal plasticity models applied to synthetically reconstructed microstructures. A computational framework has been developed to automate standardized analysis of crystal plasticity models in the high cycle fatigue regime. This framework incorporates synthetic microstructure generation, simulation preparation, execution and post-processing to analysis statistical distributions related to fatigue properties. Additionally, a

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36

Joo, Young-Chang. "Electromigration failure and reliability of single-crystal and polycyrstalline aluminum interconnects for integrated circuits." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11446.

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37

Reeder, Andrew J. "An investigation of aluminium intermetallic phases using ⁵⁷Fe Mössbauer spectroscopy and complementary techniques." Thesis, Sheffield Hallam University, 2000. http://shura.shu.ac.uk/20269/.

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Pure intermetallic compounds Al3Fe, AlmFe, AlxFe, ac-AlFeSi, and Al6(Fe,Mn) have been extracted from Bridgman grown model aluminium alloys by dissolving the aluminium matrix in butanol. The resultant transmission Mdssbauer spectra for each intermetallic compound were interpreted according to their crystal structure. Variable temperature 57Fe Mdssbauer studies have enabled the Debye temperature thetaD of each compound to be determined. The crystal structure of Al3Fe contains five different Fe sites within the unit cell. Four of the iron, Fe(l)-Fe(4), sites are approximately identical and produc

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38

Konoike, Takehiro. "Strengthening of single crystal alpha-alumina with ion implantation." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20826.

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39

Alshaikhi, Abdullah Ali. "Thermal conductivity of single crystal, and micro and nanocrystalline ceramic aluminium nitride." Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496090.

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In this thesis, phonon transport properties in single crystal and ceramic aluminium nitride (AIN) have been studied. The Callaway theory (within the Debye's isotropic continuum scheme) has been applied in its full form with a detailed account of three-phonon scattering processes in order to calculate the thermal conductivity of different AIN samples. Other phonon scattering processes have also been taken into account. The N-drift contribution, due to the momentum conserving nature of three-phonon Normal processes, to the total conductivity has been quantified. The influence on the thermal cond

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40

Peat, Karen Louise. "The mechanisms of ethylene epoxidation on the K+Cl+NO promoted Ag/#alpha#-Alâ†2Oâ†3 catalyst." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318421.

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41

Kaneko, Mitsuaki. "Strain-Controlled AlN Growth on SiC Substrates." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217172.

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42

Lee, Myoung-Bok. "The growth and spectroscopic characterisation of ultra-thin aluminium oxide films on single crystal metal surfaces." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309877.

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43

Johnston, Stephen R. "FINITE ELEMENT SIMULATIONS OF THREE-DIMENSIONAL MICROSTRUCTURALLY SMALL FATIGUE CRACK GROWTH IN 7075 ALUMINUM ALLOY USING CRYSTAL PLASTICITY THEORY." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242005-133331/.

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This thesis discusses plasticity-induced crack closure based finite element simulations of small fatigue cracks in three dimensions utilizing crystal plasticity theory. Previously, modeling has been performed in two dimensions using a double-slip crystal plasticity material model. The goal of this work is to extend that research using a full three-dimensional FCC crystal plasticity material model implementation that accounts for all twelve FCC slip systems. Discussions of Python scripts that were written to perform analyses with the commercial finite element code ABAQUS are given. A detailed d

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44

Priest, Matthew. "Synthesis of reactive element-modified aluminide coatings on single-crystal Ni-based superalloys by a pack cementation process a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=26&did=1760523421&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1254926883&clientId=28564.

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45

Wen, Wei. "A THREE-DIMENSIONAL QUANTITATIVE UNDERSTANDING OF SHORT FATIGUE CRACK GROWTH IN HIGH STRENGTH ALUMINUM ALLOYS." UKnowledge, 2013. http://uknowledge.uky.edu/cme_etds/18.

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The behaviors of short fatigue crack (SFC) propagation through grain boundaries (GBs) were monitored during high cycle fatigue in an Al-Li alloy AA8090. The growth behaviors of SFCs were found to be mainly controlled by the twist components (α) of crack plane deflection across each of up to first 20 GBs along the crack path. The crack plane twist at the GB can result in a resistance against SFC growth; therefore SFC propagation preferred to follow a path with minimum α at each GB. In addition to the grain orientation, the tilting of GB could also affect α. An experiment focusing on quantifying

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46

Zhang, Kai. "Multi-level Modelling of Plastic Anisotropy of Aluminium Alloys Using Crystal Plasticity Models and Advanced Yield Functions." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25197.

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The hood, doors and other panels of a car can be made by aluminium sheets, through complex forming operations. Design of forming processes requires trustable models and simulations. Forming properties are different in different directions. There are two principle ways to describe this plastic anisotropy of metals. The first one is the continuum theories for materials. The flow properties in various directions are described by the yield function. It is a parametric function calibrated by experimental tests. Unfortunately only a few mechanical tests can be directly used. The second approach take

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47

Dwyer, Liam Paul. "Steps toward a through process microstructural model for the production of aluminium sheet." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/steps-toward-a-through-process-microstructural-model-for-the-production-of-aluminium-sheet(cac0d9a4-0bc5-47e1-ac15-689d02c7c1d4).html.

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Aluminium sheet production is a multi-stage process in which altering processing conditions can drastically alter the size and type of second phase particles found in the final product. The properties of these second phase particles also affects deformation and annealing processes, meaning that any attempt to create a through process model would require the ability to predict both how the particles would develop in the material, and how these particles then affect the alloy moving forward. This project first focuses on gaining insight into how the particles in a model aluminium alloy change du

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48

Chryssou, Costas. "Fabrication, characterisation and modelling of rare-earth doped alumina (A1203) thin films for opto-electronics." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299285.

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49

Aka, Gérard. "Alumino-gallates de sodium-lanthanide de type alumine beta, magnetoplombite ou mixte : cristallochimie, etude spectroscopique et proprietes physiques." Paris 6, 1988. http://www.theses.fr/1988PA066008.

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Obtention des composes a structure mixte par echange ionique en sel fondu d'ions lanthanides trivalents sur les cristaux d'aluminogallate de sodium, na::(1+y)(al::(1-x)ga::(x))::(11) o::(17+(y/2)), obtenus par la methode du fondant, avec 0,5y1 et 0x0,5. Caracterisation par des mesures de susceptibilite magnetique et conductivite electrique. Analyse des spectres rpe pour localiser les ions lanthanides dans les structures de type alumine beta ou mixte, pour lesquelles les etudes d'absorption optique, de fluorescence et de declin de fluorescence indiquent des proprietes optiques differentes des i

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50

Liew, H. J. "Short range order and phase separation in Ti-rich Ti-Al alloys." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300793.

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