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Dissertations / Theses on the topic 'Alloy grain structure'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Flood, S. C. "Factors affecting the grain structure during solidification." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355749.

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2

Bommareddy, Aravinda Reddy Materials Science &amp Engineering Faculty of Science UNSW. "Thermal stability of submicron grain structure in an Al-Sc alloy." Publisher:University of New South Wales. Materials Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/41492.

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Severe plastic deformation (SPD) has been used over the past few decades for producing submicron grain (SMG) structures in range of metals and alloys. Equal channel angular pressing (ECAP) is a useful process for producing these types of structures whereby the material is deformed to very high plastic strains by passing a billet several times through the ECAP die. This process has an added advantage maintaining the initial dimensions of the billet. SMG materials produced by ECAP and related routes are useful as they usually exhibit excellent properties including high strength and hardness, and

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3

Knowlton, Brett D. (Brett Douglas). "The effects of grain structure and Cu distribution on the relability of near-bamboo Al-Cu alloy interconnects." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10379.

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4

Williams, Cory R. "The Effects of Scandium and Zirconium Additions on Aluminum Mechanical Properties, Post-Braze Grain Structure, and Extrusion." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1331521298.

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5

Hlavnička, Radek. "Únavové vlastnosti ultrajemnozrnných Mg slitin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231379.

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This thesis deals with the influence of grain refinement by ECAP on fatigue properties of magnesium alloy AZ 91. Tensile and fatigue tests were made on the as-cast state samples and samples after ECAP process. Metallographic analysis of the microstructure and fractographic analysis of the fracture surfaces was performed.

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6

Dorban, Andrew Michael. "Superplasticity of Quasi single phase alloys : the influence of grain structure." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498228.

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7

Kerans, Ronald James. "Structure of grain boundaries and aspects of deformation behavior in Ni?Al alloys /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487592050230755.

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8

Laukli, Hans Ivar. "High Pressure Die Casting of Aluminium and Magnesium Alloys : Grain Structure and Segregation Characteristics." Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-379.

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<p>Cold chamber high pressure die casting, (HPDC), is an important commercial process for the production of complex near net shape aluminium and magnesium alloy castings. The work presented in the thesis was aimed at investigating the microstructure formation in this type of casting. The solidification characteristics related to the process and the alloys control the formation of grains and defects. This again has a significant impact on the mechanical properties of the castings.</p><p>The investigations were carried out mainly using the AM60 magnesium alloy and the A356 aluminium alloy. Two d

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9

Mirabelli, Thomas G. "The effect of gravity on the evolution of pore and grain structure during liquid-phase sintering." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20021.

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10

Li, Shimin. "Hot Tearing in Cast Aluminum Alloys: Measures and Effects of Process Variables." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-dissertations/203.

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Hot tearing is a common and severe defect encountered in alloy castings and perhaps the pivotal issue defining an alloy's castability. Once it occurs, the casting has to be repaired or scraped, resulting in significant loss. Over the years many theories and models have been proposed and accordingly many tests have been developed. Unfortunately many of the tests that have been proposed are qualitative in nature; meanwhile, many of the prediction models are not satisfactory as they lack quantitative information, data and knowledge base. The need exists for a reliable and robust quantitative tes

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11

Sarsfield, Helen. "Development of a three dimensional grain structure submodel : experimental characterisation and numerical modelling of Ti-6Al-4V at elevated strain rates." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670174.

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12

Meiners, Thorsten [Verfasser], Gerhard [Gutachter] Dehm, and Erdmann [Gutachter] Spieker. "Grain boundary structure, phase transitions and segregation phenomena in copper alloys / Thorsten Meiners ; Gutachter: Gerhard Dehm, Erdmann Spieker ; Fakultät für Maschinenbau." Bochum : Ruhr-Universität Bochum, 2020. http://d-nb.info/1211178935/34.

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13

Peter, Nicolas Jörg [Verfasser], Gerhard [Gutachter] Dehm, and Eduard [Gutachter] Arzt. "Structure, chemistry and nanomechanics of grain boundaries in Cu-Ag alloys / Nicolas Jörg Peter ; Gutachter: Gerhard Dehm, Eduard Arzt ; Fakultät für Maschinenbau." Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1240479352/34.

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14

Gougeon, Gilles. "Etude par analyse automatique d'images de la forme de la texture d'alliages al-si." Caen, 1988. http://www.theses.fr/1988CAEN2001.

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Analyse de l'evolution de la macrostruture et de la microstruture des alliages de fonderie aluminium-silicium as7g en fonction de la composition, des conditions de solidification et des traitements thermiques. L'etude de la macrostruture s'est faite a partir de la reconstruction des zones eutectiques en utilisant des transformations morphologiques et en respectant les conditions de la connaissance locale simple. Quantification de la macrostructure a partir des analyses granulometriques et stereologiques. L'analyse de la microstructure est realisee a partir d'une etude globale de la forme des p

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15

Antonysamy, Alphons Anandaraj. "Microstructure, texture and mechanical property evolution during additive manufacturing of Ti6Al4V alloy for aerospace applications." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/microstructure-texture-and-mechanical-property-evolution-during-additive-manufacturing-of-ti6al4v-alloy-for-aerospace-applications(03c4d403-822a-4bfd-a0f8-ef49eb65e7a0).html.

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Additive Manufacturing (AM) is an innovative manufacturing process which offers near-net shape fabrication of complex components, directly from CAD models, without dies or substantial machining, resulting in a reduction in lead-time, waste, and cost. For example, the buy-to-fly ratio for a titanium component machined from forged billet is typically 10-20:1 compared to 5-7:1 when manufactured by AM. However, the production rates for most AM processes are relatively slow and AM is consequently largely of interest to the aerospace, automotive and biomedical industries. In addition, the solidifica

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16

Cai, Pei. "A MICROSTRUCTURE-BASED MODEL VALIDATED EXPERIMENTALLY FOR QUANTIFICATION OF SHORT FATIGUE CRACK GROWTH IN THREE-DIMENSIONS." UKnowledge, 2018. https://uknowledge.uky.edu/cme_etds/86.

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Built on the recent successes in understanding the crystallographic mechanism for short fatigue crack (SFC) growth across a grain boundary (GB) and developing an experimental method to quantify the GB resistance against short crack growth, a microstructure-based model was developed in this study to simulate the growth behaviors of SFCs in 3-D, by taking into account both the driving force and resistance along at each point along the crack front in an alloy. It was found that the GB resistance was a Weibull function of the minimum twist angle of crack deflection at the boundary in AA2024-T3 Al

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17

Nassar, Hani. "On Peritectic Reactions and Transformations and Hot Forming of Cast Structures." Doctoral thesis, Stockholm : Royal Institute of Technology, Department of Material Science and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10006.

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18

Germond, Jeffrey. "Structural Characterization and Thermoelectric Performance of ZrNiSn Half-Heusler Compound Synthesized by Mechanical Alloying." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1197.

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Thermoelectric (TE) ZrNiSn samples with a half-Heusler atomic structure were synthesized by mechanical alloying (MA) and consolidation by either Spark Plasma Sintering (SPS) or hot pressing (HP). X-Ray diffraction patterns of as milled powders and consolidated samples were compared and analyzed for phase purity. Thermal conductivity, electrical conductivity and Seebeck coefficient are measured as a function of temperature in the range 300 K to 800 K and compared with measurements reported for high temperature solid state reaction synthesis of this compound. HP samples, compared to SPS samples,

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19

Duchaussoy, Amandine. "Déformation intense d'alliages d'aluminium à durcissement structural : mécanismes de précipitation et comportement mécanique." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR135.

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La combinaison de deux mécanismes permettant d’accroitre la résistance mécanique (précipitation et joints de grains) a été explorée dans cette thèse afin d’augmenter les propriétés d’alliages d’aluminium à durcissement structural de la série 7###. Les techniques d’élaboration par déformation plastique intense permettent d’obtenir des alliages nano-structurés comportant une grande densité de joints de grains qui permet une augmentation conséquente de la limite d’élasticité selon la loi de Hall-Petch. Cependant, la grande densité de défauts (dislocations, lacunes, joints de grains…) et les contr

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20

Wang, Hsi-Ching, and 王璽清. "Electromigration and Annealing Grain Structure of Ag Alloy Wires for Electronic Packaging." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/ycbzr3.

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博士<br>國立臺灣大學<br>材料科學與工程學研究所<br>101<br>The Ag-8Au-3Pd wire can achieve enrichment of annealing twins by improvement of drawing and annealing processes. It remains almost the same grain size during aging at 600℃ for 180 minutes, thus possesses high thermal stability. Besides, the twinned-grain percentage of this wire reachs 65%, more than conventional Ag-8Au-3Pd wire, gold wire and copper wire. After high temperature storage, this wire still has higher tensile strength, yield stress, elongation than conventional Ag-8Au-3Pd wire, keeping high electrical conductivity meantime. This innovative anne

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21

Wei-TingHsieh and 謝瑋庭. "Molecular Dynamics Simulation of Mechanical Properties of Different Grain Sizes and Gradient-Nano-Grain Structure of Copper-Silver Alloy." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/z3s6x3.

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碩士<br>國立成功大學<br>機械工程學系<br>107<br>In this work, the mechanical properties and fracture behaviors of the structures with different grain sizes and Gradient-Nano-Grain (GNG) of Cu50Ag50 alloy were individually investigated under the uniaxial tensile stress. Molecular dynamics (MD) simulation with Finnis-Sinclair (FS) potential was adopted in numerical simulation. Grain sizes of 16.97 nm, 12 nm and 2.68 nm were selected in the samples with the mean grain sizes and GNG structure. Common neighbor analysis (CNA) and radial distribution function (RDF) method were employed for structure identification.

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22

Giallonardo, Jason. "Structure and Properties of Electrodeposited Nanocrystalline Ni and Ni-Fe Alloy Continuous Foils." Thesis, 2013. http://hdl.handle.net/1807/43571.

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This research work presents the first comprehensive study on nanocrystalline materials produced in bulk quantities using a novel continuous electrodeposition process. A series of nanocrystalline Ni and Ni-Fe alloy continuous foils were produced and an intensive investigation into their structure and various properties was carried out. High-resolution transmission electron microscopy (HR-TEM) revealed the presence of local strain at high and low angle, and twin boundaries. The cause for these local strains was explained based on the interpretation of non-equilibrium grain boundary structures

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23

Chen, Hsu-Feng, and 鄭旭峰. "Uniform Equiaxed Grain Structure throughout Thickness ofHot-rolled5083 Al-Mg-Mn alloy Thick Plate after a Tempering Treatment." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/60498604094842467282.

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碩士<br>國立中興大學<br>材料工程學系所<br>94<br>In a conventional hot-rolled 5038 al-Alloy thick plate, the crystalline structure at the central part in the thickness direction comprises primarily slender grains. However, the grain structure is always equiaxed near the surface of the rolling plate. In this experiment, the shape of the slab before hot rolling was changed to a trapezoid. A main goal is to increase the amount of plastic strain, increasing the dislocation density in the central part of the plate hot-rolled from the trapezoidal aluminum slab. The experimental results indicated that, according

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24

Lin, Chun-Yi, and 林春億. "Effect of FSP on Microstucture and Tensile Properties of 5083 Casting Al Alloy with Equal Axial Grain Structure." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/52049572758377656389.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>94<br>Fully-annealed 5083 Al casting alloy (5083C) has an equiaxed grain structure. Because of its high specific tensile strength, great corrosion resistance, and uniform expansion properties, it has been used to manufacture the cases of heating furnaces in semiconductor industry in recent years. Sometimes, 5083C Al thin sheets are also used to produce some components of semiconductor equipments. Friction stir welding (FSW) is a solid-state joining process providing better mechanical properties than fusion welding process. Friction stir processing (FSP) is an e

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25

Pao-TingLiang and 梁寶庭. "Effects of directional grain structure and temperature on the dynamic deformation behavior and microstructure characteristics of 7075-T6 aluminum alloy." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24963698096693551183.

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碩士<br>國立成功大學<br>機械工程學系<br>102<br>In this study, 7075-T6 aluminum alloy was examined under different grain directions, strain rates and temperatures using split-Hopkinson pressure bar in order to investigate its dynamic deformation behaviors and microstructure characteristics. The cylindrical specimens were prepared from longitudinal and transverse direction, respectively. Impact tests were performed under different strain rates of 103 s-1, 2×103 s-1, 3×103 s-1 and 5×103 s-1 at room temperature for transverse specimens and at both room temperature and high temperature of 350ºC for longitudinal

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26

Le, Yiping. "Solidification cracking, grain structure and grain refining mechanisms in GTA welds of aluminum alloys." 1986. http://catalog.hathitrust.org/api/volumes/oclc/15673380.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1986.<br>Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 174-179).

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27

Su, Che-Hsuan, and 蘇哲萱. "A study on Hall-Petch relationship and grain growth of ternary to quinary FCC-structured medium/high entropy alloys." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6ab79a.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>106<br>In this study, recrystallization behavior and grain growth characteristics of homogenized and 80% cold-rolled FeCoNiCrMn、FeCoNiCrPd、FeCoNiCr、FeCoNiMn、CoNiCr and CoNiMn multi-component equiatomic medium / high entropy alloys(MEAs/HEAs) heated at different annealing time and temperature are investigated. The values of δ、∆H_mix and VEC in these six alloys all indicate the formation of single-phase FCC structure. The hardness of recrystallized alloys decreases as the grain size increases, and obeys the Hall-Patch equation, Hv=H0+KHd-1/2. The ternary CoNiCr al

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28

Chen, Chin-Chun, and 陳治均. "Evolution of Grain Structures and Morphological Observation of Crystal-Melt Interface during Electric Molten Zone Crystallization of Silicon and Silicon-Germanium Alloy Wafers." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/16047119476696770764.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>103<br>The evolution of grain structures, especially the types of grain boundaries (GBs), during directional solidification is crucial to the electrical properties of multicrystalline silicon used for solar cells. To study this, the electric molten zone crystallization (EMZC) of silicon wafers at different drift speeds from 2 to 6 mm/min was considered. It was found that <111> orientation was dominant at the lower drift velocity, while <112> orientation at the higher drift velocity. Most of the non-∑GBs tended to aligned with the thermal gradient, but some tilted to

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29

金武, 直幸, 孝至伊藤, 眞. 小橋, 秀男佐野 та 俊勝小池. "圧縮・せん断複合負荷による高機能軽金属粉末の組織制御成形法". 2002. http://hdl.handle.net/2237/13117.

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