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Dissertations / Theses on the topic 'Deformation Texture'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Kiwanuka, Robert. "Micro-deformation and texture in engineering materials." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:3c924d01-7501-4d59-bb53-07e6584e50c5.

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This DPhil project is set in the context of single crystal elasticity-plasticity finite element modelling. Its core objective was to develop and implement a methodology for predicting the evolution of texture in single and dual-phase material systems. This core objective has been successfully achieved. Modelling texture evolution entails essentially modelling large deformations (as accurately as possible) and taking account of the deformation mechanisms that cause texture to change. The most important deformation mechanisms are slip and twinning. Slip has been modelled in this project and care

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2

Warwick, Jonnathan L. W. "Texture, microstructure and deformation mechanism in titanium alloys." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24971.

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This thesis develops an understanding of the microstructure and texture evolution, it identi- fies the corresponding micromechanisms which occur during deformation of two titanium alloys, Ti-6Al-4V and commercial purity titanium (CPTi). Particular emphasis is placed on the thermo- mechanical processing required to produce globular α-phase morphologies and the concomitant evolution in texture. In-situ synchrotron X-ray diffraction recrystallisation experiments were performed in order to trace parent to globular textures. During rolling, the α (0002) basal texture softens due to kinking of the c

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3

Mu, Sijia [Verfasser]. "The effects of twinning on deformation texture / Sijia Mu." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1026310180/34.

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4

Griffiths, David Glyndwr John. "Understanding texture weakening in magnesium rare earth alloys." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/understanding-texture-weakening-in-magnesium-rare-earth-alloys(3823f6a8-bba7-415f-9326-adc1b1655c8c).html.

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Magnesium has the lowest density of any structural metal making it a strong candidate for weight savings in the aerospace and automotive industries. However, strong crystallographic textures combine with anisotropic deformation modes to severely limit formability in wrought magnesium alloys. Recently improved formability has been achieved by the addition of small concentrations of solute rare earth elements which reduce the intensity of recrystallisation textures. Developing a mechanistic understanding of this effect is critical in leading alloy design towards a new class of highly formable wr

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5

Bronkhorst, Curt Allan. "Plastic deformation and crystallographic texture evolution in face-centered cubic metals." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13457.

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6

Hsu, Emilie Chia Ching 1979. "Effect of deformation conditions on texture and microstructure of magnesium sheet AZ31." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99768.

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Magnesium alloys have a great potential in automotive industries, compared to steel and aluminium (Al), Magnesium (Mg) is much lighter and this weight reduction improves fuel efficiency and lowers green gas emission. Due to its hexagonal crystal structure, magnesium has poor ductility at room temperature. Magnesium's ductility improves significantly above about 200°C due to thermal activation of additional slip systems. This has lead to efforts to form auto-body panels with commercial AZ31 magnesium sheet at elevated temperatures. In this work, various AZ31 magnesium alloy materials were used

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Bacroix, Brigitte. "Prediction of high temperature deformation textures in FCC metals." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74036.

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8

Zeng, Zhipeng. "Deformation Behaviour, Microstructure and Texture Evolution of CP Ti Deformed at Elevated Temperatures." Doctoral thesis, Stockholm : Skolan för industriell teknik och management, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10404.

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9

Vempati, Vamsi Krishna. "Texture Evolution In Materials With Layered Crystal Structures." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1621942851365157.

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10

Honniball, Peter Daniel. "The influence of temperature upon the deformation of alpha zirconium." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-temperature-upon-the-deformation-of-alpha-zirconium(ea5d6180-0730-492f-89ab-04c6938398f1).html.

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Zirconium is used inside nuclear reactors as fuel cladding. The in-reactor performance of zirconium alloys is strongly influenced by the properties that develop during thermo-mechanical processing, such as the microstructure and crystallographic texture. Optimising the combination of properties would enable improved reactor efficiency, longer component lifetimes and reductions in nuclear waste. Achieving the desired texture and microstructure requires a mechanistic understanding of the processes that govern them: deformation and recrystallisation. These mechanisms are influenced by numerous va

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11

Li, Weilin. "Microstructural Evolution of a Nanocrystalline Ni-Co Alloy and Ni Introduced by Impact Deformation." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20852.

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Nanocrystalline (nc) materials exhibit superior mechanical properties compared with coarse-grained materials. Like other structural materials, in applications, nc materials are subject to tensile, shear and/or compressive stresses. While the mechanical behaviours and microstructural evolution of nc materials subject to tension, shearing or compression have been widely investigated, little has been conducted on structural behaviours under high strain rate impact. The aim of this research project is to explore how the microstructures of nc materials (nc Ni-32.8 at%Co alloy and nc pure Ni fabrica

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12

SERGHAT, MOHAMED Esling Claude. "ETUDE DU LAMINAGE A FROID D'ALLIAGES DE TITANE : MECANISMES DE DEFORMATION ET EVOLUTIONS DE TEXTURE /." [S.l.] : [s.n.], 1994. ftp://ftp.scd.univ-metz.fr/pub/Theses/1994/Serghat.Mohamed.A.SMZ9469.pdf.

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13

Gullberg, Daniel. "Influence of composition, grain size and manufacture process on the anisotropy of tube materials." Thesis, Uppsala University, Department of Engineering Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-125336.

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<p>A problem with cold pilgered tubes for OCTG applications is that they can get anisotropic properties with regard to yield strength. One source of anisotropy is texture that is developed during the cold deformation. EBSD measurements have been made on several austenitic stainless steels with different deformations to see what influence the composition has on the texture formation. The same measurements were used to study the influence of grain size on texture formation. The conclusion was that the composition can have an impact on the texture and hence has potential to also affect the anisot

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Tam, Kenneth James. "Characterising the Texture and Temperature Effects on the Deformation Mechanism of Magnesium Alloy AZ31: A Simulation Study of the Interplay between Slip, Twinning, and Dynamic Recrystallisation." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/24019.

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Two viscoplastic self-consistent (VPSC) models were developed to investigate the temperature and texture effects of a hot-rolled magnesium alloy AZ31. These models are coupled with a composite twin grain model and dislocation density based hardening laws to predict the activation and evolution of the deformation mechanisms found within magnesium. At moderate temperatures, there are a variety of active mechanisms in magnesium: ⟨a⟩ basal, ⟨a⟩ prismatic, and ⟨c+a⟩ pyramidal slip, {101 ̅2} tensile twins, and {101 ̅1} compressive twins. The validation of the models is done using an experimental stu

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15

Feitler, Isaac Benjamin. "Evolution of microstructure and crystalline texture in aluminum sheet metal subjected to high strain rate biaxial deformation." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32851.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2005.<br>Includes bibliographical references (leaves 49-50).<br>Electrohydraulic forming was used to biaxially stretch commercial Aluminum 5052 sheet metal workpieces at a high strain rate. Annealed and unannealed workpieces were formed. Specimens were taken from unformed metal and from the formed workpieces. Microstructures were examined with optical microscopy and pole figures were generated from X-ray diffraction data. Microstructures and crystalline textures were compared between formed and un

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Zhao, Yixiang. "Effects of Laser Shock Peening on Residual Stress, Texture and Deformation Microstructure of Ti-6Al-4V Alloy." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1353343745.

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Wu, Xianping Kalidindi Surya Doherty R. D. "Prediction of crystallographic texture evolution and anisotropic stress-strain response during large plastic deformation in alpha-titanium alloys /." Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1122.

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Bourque, Hugo. "Le cuivre de l'Anti-Atlas, un problème complexe : synthèse des occurrences cuprifères de la boutonnière de Bou Azzer-El Graara et nouvelles données (Anti-Atlas, Maroc)." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2055/document.

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L’Anti-Atlas marocain est une vaste province géologique composée d’un socle précambrien et d’une couverture sédimentaire tardi-néoprotérozoïque à paléozoïque. Plus de 200 occurrences cuprifères sont répertoriées dans cette couverture. Avec l’augmentation de la demande mondiale en cuivre depuis les années 2000, ces minéralisations, considérées non rentables dans les années 1980, sont désormais d’intérêt économique majeur pour les compagnies minières. Outre cet intérêt économique, ces occurrences restent un mystère scientifique du point de vue de leur genèse. En effet, les quelques études exista

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19

Hary, Benjamin. "Compréhension et modélisation de l'influence du taux de renforts et de la texture de déformation sur la recristallisation des aciers ODS ferritiques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS339/document.

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Les aciers renforcés par dispersion d’oxydes (ODS) sont envisagés comme matériaux de gainage pour les réacteurs à neutrons rapides au sodium. Ils présentent de très bonnes propriétés mécaniques, notamment en fluage, du fait de la présence des nano-renforts ainsi qu’une résistance au gonflement élevée de par leur matrice ferrito-martensitique. La gamme de fabrication des ODS ferritiques est complexe et génère une forte texture morphologique et cristallographique. Les microstructures doivent donc être recristallisées mais cette recristallisation est très souvent hétérogène et difficile à maitris

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Jin, Haiou. "The role of transition metal solutes in the deformation texture, recrystallization and grain growth in aluminum and its alloys." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ59528.pdf.

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21

Dutta, Aniruddha [Verfasser], Dierk [Akademischer Betreuer] Raabe, and Sebastian [Akademischer Betreuer] Münstermann. "Deformation behaviour and texture memory effect of multiphase nano-laminate medium manganese steels / Aniruddha Dutta ; Dierk Raabe, Sebastian Münstermann." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220082600/34.

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Bernardi, Heide Heloise. "Processamento e caracterização microestrutural de nióbio deformado plasticamente por extrusão em canal angular." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-27092012-123519/.

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Amostras de nióbio de alta pureza na forma de monocristais, bicristais e policristais foram retiradas de seções longitudinais de lingotes fundidos por feixe eletrônico. As amostras foram deformadas via extrusão em canal angular (ECAE - Equal Channel Angular Extrusion) em temperatura ambiente até 8 passes, utilizando a rota Bc numa matriz com ângulo de intersecção entre os canais de  = 90º. As amostras foram caracterizadas em termos da evolução microestrutural e da textura de deformação. A caracterização microestrutural foi realizada com o auxílio de microscopias ótica, eletrônica de va

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23

Belperin, Maxime. "Génération de texture par anamorphose pour la décoration d’objets plastiques injectés." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10078/document.

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Le contexte de ma thèse rentre dans le cadre du projet IMD3D, supporté par le FUI. L'objectif de ce projet consiste à proposer une méthode automatisée permettant la décoration d'objets 3D quelconques. La solution choisie consiste à positionner un film imprimé dans le moule, ce film sera déformé par la fermeture du moule puis par injection. Ma thèse porte sur la génération de décoration. Les données dont nous disposons en entrée sont un maillage et une ou plusieurs images. Nous souhaitons d'abord obtenir le plaquage de cette image sur le maillage, de telle sorte que le rendu visuel soit équival

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24

Tränkner, Christine. "Mikrostruktur- und Texturentwicklung während massiver plastischer Verformung von NiAl bei tiefen Temperaturen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-230717.

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NiAl ist eine intermetallische Verbindung mit kubischer B2-Struktur. Unterhalb der Spröd-duktil-Übergangstemperatur, die bei Normaldruck bei etwa 300°C liegt, können nach dem Von-Mises-Kriterium nicht ausreichend viele unabhängige Gleitsysteme zur homogenen plastischen Verformung aktiviert werden, da die Bruchspannung unterhalb der kritischen Schubspannung zur Aktivierung des sekundären Gleitsystems liegt. Um NiAl trotzdem massiv plastisch verformen zu können, muss die Verformung bei hohem Druck erfolgen. Dies ist beispielsweise möglich bei der Verformung mittels Gleichkanal- Winkelpressen (EC

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25

Wikström, Adam. "Modeling of stresses and deformation in thin film and interconnect line structures." Doctoral thesis, KTH, Solid Mechanics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3224.

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26

Mehtonen, S. (Saara). "The behavior of stabilized high-chromium ferritic stainless steels in hot deformation." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526204949.

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Abstract In this thesis, the hot deformation behavior of stabilized 12–27% Cr ferritic stainless steels was investigated in order to find ways to improve the current hot rolling schedules for enhancing texture structures and deep drawability of the end product. Hot deformation was studied using axial and plane strain compression in two thermomechanical simulators: a Gleeble and a TMC machine. In addition to flow stress measurements, the resultant microstructures and textures were investigated using electron backscatter diffraction (EBSD), and the dislocation structures using transmission elect

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27

Haase, Christian [Verfasser], Dmitri A. [Akademischer Betreuer] Molodov, and Wolfgang [Akademischer Betreuer] Bleck. "Texture and microstructure evolution during deformation and annealing of high-manganese TWIP steels / Christian Haase ; Dmitri A. Molodov, Wolfgang Bleck." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130590003/34.

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Xu, Wanqiang Materials Science &amp Engineering Faculty of Science UNSW. "Effect of initial microstructure on the deformation and annealing behaviour of low carbon steel." Awarded by:University of New South Wales. School of Materials Science and Engineering, 2006. http://handle.unsw.edu.au/1959.4/26801.

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The effect of initial microstructures of an 0.05 wt.% C low carbon steel, acicular ferrite (AF), Bainite (B), polygonal ferrite (PF), fine polygonal ferrite (FPF), and a microstructure produced by direct strip casting (DSC) (termed SC), on the deformation and recrystallization behaviour of cold rolled low carbon (LC) steel, was investigated. The initially prepared samples with the initial microstructures were cold rolled to 50, 70 and 90% reductions, then annealed isothermally in the temperature range 580 ??? 680 oC. The microstructures and textures produced by deformation and annealing wer

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Wen, Wei. "Simulation of large deformation response of polycrystals, deforming by slip and twinning, using the viscoplastic Ø-model." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00959709.

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The computation of the macroscopic response of polycrystalline aggregates from the properties of their single-crystal is a main problem in materials mechanics. During the mechanical deformation processing, all the grains in the polycrystalline material sample are reoriented. A crystallographic texture may thus be developed which is responsible for the material anisotropy. Therefore, the modeling of the texture evolution is important to predict the anisotropy effects present in industrial processes. The formulation of polycrystals plasticity has been the subject of many studies and different ap

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Akcaoglu, Fehmi Umit. "Investigating The Effect Of Deformation And Annealing Texture On Magnetic Anisotropy In Low-c Steel Sheets By Magnetic Barkhausen Noise Method." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615569/index.pdf.

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Deformation and annealing texture in the cold rolled low carbon steels is important for sheet metal forming operations and service performance. The aim of this study is to non-destructively investigate the effect of texture on magnetic anisotropy. Various samples having different textures and residual stress states, due to different % reduction in thickness, annealing and stress relieving treatment, were prepared. Texture maps were obtained by Magnetic Barkhausen noise measurements performed with 100 steps between the ranges of 00-3600 on the surface. Microstructure investigation by optical &a

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31

Viana, Neuman Fontenele. ""Efeito da deformaÃÃo plÃstica no processo de seleÃÃo de variantes na transformaÃÃo martensÃtica no aÃo inoxidÃvel austenÃtico AISI 301L"." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6025.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>O presente trabalho visou estudar o efeito da deformaÃÃo plÃstica prÃvia por laminaÃÃo e o efeito da deformaÃÃo por traÃÃo no processo de seleÃÃo de variantes durante a transformaÃÃo martensÃtica no aÃo inoxidÃvel austenÃtico AISI 301L. Foram comparadas amostras previamente laminadas e deformadas em ensaio de traÃÃo com amostras apenas deformadas plasticamente em traÃÃo. Aspectos relativos a macrotextura obtidos pela tÃcnica de difraÃÃo de Raios-x e microtextura obtidos por difraÃÃo de elÃtrons retro-espalhados (EBSD) foram estudad

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Gauss, Christian. "Evolução microestrutural do aço inoxidável dúplex UNS 532205 durante laminação a frio e posterior recozimento." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-03122015-160252/.

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Nesta Dissertação são apresentados os resultados do estudo da evolução microestrutural de um aço inoxidável dúplex UNS S32205 durante o processo de laminação a frio e posterior recozimento em 1080ºC. Amostras do aço na condição como-recebida, laminadas a frio e recozidas isotermicamente foram caracterizadas utilizando as técnicas de microscopia ótica e eletrônica de varredura, dilatometria, espectroscopia de energia dispersiva (EDS), microdureza Vickers, difração de raios X, magnetização de amostra vibrante, macrotextura e difração de elétrons retroespalhados (EBSD). No material na condição co

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Bonfils, Laure. "Characterisation of the high strain rate deformation behaviour of α-β titanium alloys at near-transus temperature". Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:e2507c22-6478-4461-be57-347382a5ee0c.

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The aim of this thesis is to provide microstructural and mechanical characterisation of α-β titanium alloys exposed to a range of thermo-mechanical conditions, in particular under-going high rate deformation at elevated temperatures, representative of the Linear Friction Welding (LFW) manufacturing process. Three α-β titanium alloys provided by Rolls-Royce are studied: Ti-64 blade, disc and Ti-6246 disc. Ti-64 and Ti-6246 show complex deformation behaviour with strain, strain rate and temperature, especially near the transus temperature, where the low temperature α phase is transformed into th

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Ljungberg, Adam, and Nathalie Schmidt. "Deformationsstrukturer i ett duplext rostfritt stål (SAF 2507)." Thesis, Högskolan Dalarna, Materialteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:du-15770.

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För att kunna förbättra processer och användning av det duplexa rostfria stålet SAF 2507 måste dess deformationsegenskaper undersökas och förklaras. Genom EBSD-analyser har deformationsstrukturer och polfgurer tagits fram för att kunna beskriva materialets beteende vid deformation. Även Taylorfaktorer, E-moduler och Poissons tal har tagits fram för att kunna undersöka materialets anisotropi. Experimenten har utförts på prov av SAF 2507 som har deformerats plastiskt till olika töjningar. Det som undersökts är odeformerat prov, prov som dragits enaxligt till 7,7 % och 24,3 % töjning, samt ett pr

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Diao, Hui. "Deformation behaviours of coarse-grained and nanocrystalline Mg-5wt% Al alloys." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46870/1/Hui_Diao%27s_Thesis.pdf.

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Magnesium alloys have been of growing interest to various engineering applications, such as the automobile, aerospace, communication and computer industries due to their low density, high specific strength, good machineability and availability as compared with other structural materials. However, most Mg alloys suffer from poor plasticity due to their Hexagonal Close Packed structure. Grain refinement has been proved to be an effective method to enhance the strength and alter the ductility of the materials. Several methods have been proposed to produce materials with nanocrystalline grain stru

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Yapici, Guney Guven. "Investigation and modeling of processing-microstructure-property relations in ultra-fine grained hexagonal close packed materials under strain path changes." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1578.

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Lainé, Steven John. "The role of twinning in the plastic deformation of alpha phase titanium." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267425.

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The optimisation of compressor stage aerofoil and fan blade design remains an important area of titanium alloy research and development for aerospace gas turbines. Such research has important implications for critical and sensitive component integrity and efficiency. In particular, a better understanding of how deformation twinning interacts with microstructural features in titanium alloys is required, because such twinning facilitates plastic deformation at a higher strain rate than dislocations. To investigate this behaviour, commercial purity titanium and the titanium alloy Ti–6Al–4V were s

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Qods, Fathallah. "Comportement mécanique des métaux polycristallins aux grandes déformations en tosion : expériences et simulations." Metz, 2006. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2006/Qods.Fathallah.SMZ0613.pdf.

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La compréhension du comportement des matériaux soumis au chargement multiaxial en grandes déformations est très importante pour beaucoup de procédés de technologie et de conception. La déformation axiale pendant l'essai de torsion est un effet qui peut être employé pour vérifier la validité d'un modèle théorique. Cet essai est également assez simple pour obtenir de bonnes données expérimentales. L'essai de torsion le plus commode est effectué sur une barre pleine de section circulaire, cependant, il y a présence d’un gradient au niveau des quantités physiques dans toute la section d'une barre

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Couvy, Hélène. "Experimental deformation of forsterite, wadsleyite and ringwoodite: Implications for seismic anisotropy of the Earth's mantle." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2005. http://tel.archives-ouvertes.fr/tel-00008992.

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L'étude de la plasticité des minéraux du manteau terrestre sous pression joue un rôle majeur dans la compréhension et la modélisation des grands processus actifs à l'intérieur de la Terre tels que la convection mantellique. Cependant, les propriétés des minéraux du manteau sont toujours, à ce jour, mal connues. L'objectif de ce travail est d'étudier la rhéologie de la partie inférieure du manteau supérieur et de la zone de transition, à travers l'étude des propriétés mécaniques de la forsterite (Mg2SiO4) et de ses deux polymorphes de haute pression (wadsleyite et ringwoodite). En effet, ces ph

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BAGHDOUCHE, FATEH ALBERT VADON ALBERT. "ETUDE DES TRANSFORMATIONS DE PHASE ET DE L'EVOLUTION DE TEXTURE CRISTALLOGRAPHIQUE EN FONCTION DU TAUX DE DEFORMATION ET DU TRAITEMENT THERMIQUE DANS L'ALLIAGE EQUIATOMIQUE TINI /." [S.l.] : [s.n.], 1998. ftp://ftp.scd.univ-metz.fr/pub/Theses/1998/Baghdouche.Fateh.SMZ9843.pdf.

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Medy, Jean Rony. "Évaluation des effets de taille et d'architecture sur les propriétés mécaniques et électriques de fils composites métalliques cuivre/niobium fabriqués par déformation plastique sévère." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2312/document.

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Les fils composites Cu/Nb étudiés ici sont d'excellents candidats pour les bobines non destructives générant des champs magnétiques pulsés intenses (B ≥ 100T). Ils sont fabriqués par Accumulative Drawing and Bundling (ADB) et sont constitué de renforts continus de Nb dans une matrice multi-échelles de Cu. Ces travaux rentrent dans le cadre du projet METAFORES (ANR-12-BS09-0002), visant l’évaluation des effets de taille et d’architecture sur les propriétés des conducteurs Cu/Nb. L’objectif principal consiste donc à caractériser leur microstructure et leurs propriétés à chaque étape de la fabric

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Maurice, Claire. "Textures de compression plane à chaud d'alliages d'aluminium : expériences et simulations." Grenoble INPG, 1994. http://www.theses.fr/1994INPG4208.

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L'anisotropie finale des toles d'alliage d'aluminium est tres sensible aux textures cristallographiques developpees au cours du laminage a chaud, et notamment a la composante cube 100<001>. Nous etudions ici l'influence des parametres vitesse et temperature de deformation sur l'evolution de la texture de laminage a chaud d'un alliage 3004 (al+1%mn+1%mg). Les etats de contrainte et de deformation du laminage sont simules au moyen d'un dispositif original de compression plane a chaud. L'augmentation de la temperature et/ou la diminution de la vitesse de deformation provoquent un accroissement sy

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Retraint, Delphine. "Déformation superplastique d'un alliage intermétallique base Ti3Al." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0177.

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L'aluminiure de titane ti-25al-10nb-3v-1mo (% at. ), egalement denomme super-alpha2, represente un alliage intermetallique susceptible de remplacer les alliages de titane conventionnels utilises a l'heure actuelle dans l'aeronautique: il allie une faible densite par rapport aux superalliages, une plus grande resistance mecanique et une meilleure tenue a l'oxydation que les alliages de titane conventionnels. Par ailleurs, son aptitude a presenter des proprietes superplastiques a haute temperature peut constituer un procede de mise en forme industriel de cet alliage. L'objet de ce travail a ete,

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Sojiphan, Kittichai. "Effects of Very High Power Ultrasonic Additive Manufacturing Process Parameters on Hardness, Microstructure, and Texture of Aluminum 3003-H18 Alloy." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1418667794.

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Löw, Marjorie. ""Mecanismos de desenvolvimento de textura durante a recristalização primária de aços ferríticos por difração de Raio-X e difração de Elétrons retroespalhados"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-06062007-161839/.

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A difração de raios X e de elétrons retroespalhados, em escalas distintas, foram aplicadas para acompanhar mudanças microestruturais em dois aços ferríticos baixo carbono (2%Si e ABNT 1006), observando-se o desenvolvimento da textura nas etapas de laminação a frio (skin-pass) e recozimento a 760 oC. Para ambos os aços, os resultados permitiram afirmar que o fenômeno que ocorre após a laminação por skin-pass e tratamento térmico, nas condições deste trabalho, é a recristalização primária. A aplicação do skin-pass criou mais discordâncias em grãos com baixo fator de Taylor por sofrerem mais defo

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Kauffmann, Alexander. "Gefügeverfeinerung durch mechanische Zwillingsbildung in Kupfer und Kupfermischkristalllegierungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-144747.

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Die vorliegende Arbeit zeigt einen Weg, Kupfer und einphasige Kupferlegierungen mit stark verzwillingten Gefügen durch ein technisch relevantes Umformverfahren herzustellen. Der Drahtzug bildet dabei aufgrund seines Spannungszustands und der entsprechenden Texturentwicklung in kubischflächenzentrierten Metallen ein ideales Umformverfahren, um einen Großteil des Gefüges durch mechanische Zwillingsbildung zu verfeinern. Für die Aktivierung der Zwillingsbildung in reinem Kupfer unter den untersuchten Werkstoffvarianten sind Temperaturen nahe der Temperatur des flüssigen Stickstoffs notwendig. Um

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Laumonier, Mickaël. "Mélange de magmas à HP-HT : contraintes expérimentales et application au magmatisme d'arc." Phd thesis, Université d'Orléans, 2013. http://tel.archives-ouvertes.fr/tel-00859628.

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Trois magmas (haplotonalite synthétique, basalte et dacite de Santorin) ont été juxtaposés et déformés à l'aide d'une presse de type Paterson pour contraindre les conditions de mélange de magmas à haute pression (300 MPa). Ces trois magmas ont été utilisés en conditions sèches ou hydratées et dans une gamme de température comprise entre 600 et 1200°C, permettant d'obtenir plusieurs fractions cristallines et contrastes de viscosité. Les textures de mélange produites lors des expériences dépendent de la fraction cristalline et sont similaires aux textures rencontrées dans la nature. Les textures

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Basnet, Shiva. "Spatial Analysis of Rock Textures." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1349988757.

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Wehrenberg, Christopher. "Phase transformations in shock compacted magnetic materials." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43595.

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Shock compaction experiments were performed on soft magnetic phases Fe₄N and Fe₁₆N₂, and hard magnetic phases Nd₂Fe₁₄B and Sm₂Fe₁₇N₃ in order to determine their thermo-mechanical stability during shock loading and explore the possibility of fabricating a textured nanocomposite magnet. Gas gun experiments performed on powders pressed in a three capsule fixture showed phase transformations occurring in Fe₄N, Fe₁₆N₂, and Nd₂Fe₁₄B, while Sm₂Fe₁₇N₃ was observed to be relatively stable. Shock compaction of FCC Fe₄N resulted in a partial transformation to HCP Fe₃N, consistent with previous reports of

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Edmonds, Hannah. "Interlaminar bonding in ultrasonic consolidation." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10999.

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Ultrasonic Consolidation (UC) is a solid state additive manufacturing process which fabricates three-dimensional objects by ultrasonically joining metal foils together, layer-bylayer, to form a solid part. A wide range of materials can be used to fabricate parts by UC and products with complex internal geometry can be generated by shaping the crosssection throughout the build using Computer Numerically Controlled (CNC) milling. As a result of its ability to embed various secondary materials and fibres in metal matrices, UC has emerged as a potential method of fabricating multi-functional mater

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