Dissertations / Theses on the topic 'Crystal deformation'
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Thompson, Robert Peter. "Plastic deformation in complex crystal structures." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/286335.
Full textCumbest, Randolph J. "Crystal-plastic deformation and chemical evolution of clinoamphibole." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54322.
Full textPh. D.
Sherry, A. H. "The deformation and fracture of a single crystal superalloy." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384116.
Full textHillier, Graham Stewart. "The defect energies and deformation mechanisms of single crystal superalloys." Thesis, University of Cambridge, 1985. https://www.repository.cam.ac.uk/handle/1810/221896.
Full textChen, Tzung-Ming. "Synthesis of compliant single crystal silicon mechanisms with large deformation." Tönning Lübeck Marburg Der Andere Verl, 2009. http://d-nb.info/995862664/04.
Full textRowell, D. K. "Point defect calculations in ionic crystals." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370129.
Full textMilligan, Walter W. Jr. "Yielding and deformation behavior of the single crystal superalloy PWA 1480." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20152.
Full textLiang, Hong. "Crystal plasticity modelling of lengthscale effects in deformation and nano-indentation." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496995.
Full textWestbrooke, Eboni F. "Effect of crystallographic orientation on plastic deformation of single crystal nickel-base superalloys." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011466.
Full textChaloupka, Ondrej. "Modelling evolution of anisotropy in metals using crystal plasticity." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8435.
Full textVempati, Vamsi Krishna. "Texture Evolution In Materials With Layered Crystal Structures." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1621942851365157.
Full textThistlethwaite, T. "Crystal deformation and structure of oriented poly(ethylene terephthalate), poly(pentamethylene terephthalate) and polyethylene." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355475.
Full textHan, Songlin. "High temperature deformation modelling and finite element implementation for single crystal turbine blade materials." Thesis, University of Bristol, 2000. http://hdl.handle.net/1983/943aaa75-6406-4a06-9250-9b0ae85a5eae.
Full textWu, 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.
Full textHusser, Edgar [Verfasser], and Swantje [Akademischer Betreuer] Bargmann. "Micromechanical modeling of size-dependent crystal plasticity and deformation twinning / Edgar Husser ; Betreuer: Swantje Bargmann." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2019. http://d-nb.info/1193575192/34.
Full textKaramched, Phani Shashanka. "Deformation studies near hard particles in a superalloy." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:e740592d-8d82-4c12-9bfe-99901d132b60.
Full textZhou, Ning. "Simulation Study Of Directional Coarsening (Rafting) Of γ' In Single Crystal Ni-Al." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228152557.
Full textAl-Harbi, Hamad F. "Crystal plasticity finite element simulations using discrete Fourier transforms." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51788.
Full textLi, Lin. "A Quantized Crystal Plasticity Model for Nanocrystalline Metals: Connecting Atomistic Simulations and Physical Experiments." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299605340.
Full textShyue, Jein. "The effects of alloying on the crystal structure and plastic deformation of the intermetallic compound Nb?Al /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487779439844711.
Full textShepherd, James Ellison. "Multiscale Modeling of the Deformation of Semi-Crystalline Polymers." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10479.
Full textJensen, Katharine Estelle. "Structure and Defects of Hard-Sphere Colloidal Crystals and Glasses." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11052.
Full textPhysics
Ilin, Dmitrii. "Simulation of hydrogen diffusion in fcc polycrystals. Effect of deformation and grain boundaries : effect of deformation and grain boundaries." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0157/document.
Full textIn the present work, we establish a one-way coupled crystal plasticity – hydrogen diffusion analysis and use this approach to study the hydrogen transport in artificial polycrystalline aggregates of 316L steel with different grain geometries and crystallographic orientation. The data about stress/strain fields computed at the microstructure scaleutilizing the crystal plasticity concept are transferred to the in-house diffusion code which was developed using a new numerical scheme for solving parabolic equations. In the case of initial uniform hydrogen content, the heterogeneity of the mechanical fields is shownto induce a redistribution of hydrogen in the microstructure. The effect of strain rate is clearly revealed. In the second part, hydrogen transport across grain boundaries is investigatedconsidering the specific diffusivity and segregation properties of these interfaces. Using a discrete atomic layer model, the retarding impact of grain boundaries is demonstrated on bicrystals and bamboo type membranes with and without external mechanical loading. To reproduce the effects observed in the atomistic simulations into the crystal plasticity – hydrogen diffusion model, a new physically based multi-scale method is proposed. Using this new approach we study the effect of grain boundary trapping kinetics on hydrogen diffusion and reveal a new grain boundary diffusion regime which has notbeen reported before
CUNHA, CECILIO A. da. "Desenvolvimento de revestimentos nanostruturados de Crsub(2)Crsub(2)-25(Ni20Cr)." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10125.
Full textMade available in DSpace on 2014-10-09T14:00:02Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Bönisch, Matthias. "Structural properties, deformation behavior and thermal stability of martensitic Ti-Nb alloys." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-207914.
Full textTi-Nb Legierungen zeichnen sich durch eine vielfältige Metallurgie aus, die es nach sorgfältiger Auswahl der chemischen Zusammensetzung sowie der thermischen und mechanischen Prozessierungsroute ermöglicht eine große Bandbreite mikrostruktureller Konfigurationen und physikalischer Eigenschaften zu erhalten. Das Ziel der vorliegenden Arbeit ist es den gegenwärtigen Wissensstand über martensitbildende Ti-Nb Legierungen zu erweitern. Zu diesem Zweck werden 15 binäre Ti-c_{Nb} Nb (9 Gew.% ≤ c_{Nb} ≤ 44.5 Gew.%) Legierungen hinsichtlich ihrer strukturellen und mechanischen Eigenschaften sowie ihrer thermischen Stabilität untersucht. Die Kristallstrukturen der martensitischen Phasen, α´ und α´´, sowie der Einfluss des Nb-Gehalts auf die Gitterverzerrung (Bain-Verzerrung), auf die Verschiebungswellenkomponente (Shuffle-Komponente) und auf die Volumenänderung der martensitischen β → α´/α´´ Transformationen werden anhand von Rietveld-Verfeinerungen analysiert. In Abhängigkeit des Nb-Gehalts tritt entweder eine Volumendilatation oder -kontraktion auf, die bestimmen könnte ob hexagonaler Martensit α´ oder orthorhombischer Martensit α´´ aus β bei Abkühlung gebildet wird. Die mechanischen Eigenschaften und das Verformungsverhalten martensitischer Ti-Nb Legierungen werden mit einer Reihe komplementärer Methoden (monotone und zyklische einachsige Druckversuche, Nanoindentation, Mikrohärte, Impulserregungstechnik) untersucht. Die Ergebnisse zeigen durchgehend, dass die mechanischen Eigenschaften martensitischer Ti-Nb Legierungen stark vom Nb-Gehalt beeinflusst werden. Die mechanischen Kennwerte sind minimal in der Nähe der Zusammensetzungen, innerhalb derer β → α´´ bei Abkühlung auftritt. Aus Druckversuchen geht hervor, dass die elastischen Eigenschaften verformter Proben verschieden zu denen unverformter sind. Die experimentellen Ergebnisse weisen außerdem auf eine verformungsinduzierte Umwandlung von Martensit in Austenit (α´´ → β) hin. Der Einfluss des Nb-Gehalts auf die thermische Stabilität und das Auftreten von Zerfallsreaktionen in martensitischen Ti-Nb Legierungen wird anhand von dynamischer Differenzkalorimetrie, Dilatometrie, und in-situ Synchrotronröntgenbeugung in Kombination mit Transmissionselektronenmikroskopie untersucht. Das thermische Zerfalls- und Umwandlungsverhalten ist durch das Auftreten einer Vielzahl von in Abhängigkeit des Nb-Gehalts unterschiedlichen Phasentransformationssequenzen gekennzeichnet. Abschließend werden die Transformationstemperaturen und -wärmen, das Transformationsinterval und die thermische Hysterese der martensitischen β ↔ α´´ Umwandlung untersucht. Die Ergebnisse dieser Arbeit sind für die Entwicklung und Optimierung β-stabilisierter Ti-Legierungen für strukturelle und biomedizinische Anwendungen sowie Ni-freier Komponenten, die Formgedächtniseffekt und/oder Superelastizität aufweisen, von Nutzen
Rose, Kelly Kathleen. "Identification of Fold Hinge Migration in Natural Deformation: A New Technique Using Grain Shape Fabric Analysis." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/43205.
Full textMaster of Science
Begau, Christoph [Verfasser], Alexander [Gutachter] Hartmaier, and Dierk [Gutachter] Raabe. "Characterization of crystal defects during molecular dynamics simulations of mechanical deformation / Christoph Begau ; Gutachter: Alexander Hartmaier, Dierk Raabe ; Fakultät für Maschinenbau." Bochum : Ruhr-Universität Bochum, 2012. http://d-nb.info/1199608017/34.
Full textHu, Jianan. "A theoretical study of creep deformation mechanisms of Type 316H stainless steel at elevated temperatures." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:d956b7ff-9748-408e-a68f-31d4c1d492b5.
Full textAllen, Robert. "Exploratory simulations of multiscale effects of deformation twinning on the mechanical behavior of FCC and HCP metals." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0167.
Full textMethods designed for incorporation into multiscale modeling polycrystals are presented in this work in two tasks. This work contains mesoscale methods for capturing the effects of both the interactions of slip dislocations encountering twin grain boundaries and the simultaneous growth of multiple twin grain volume fractions on mechanical hardening and texture evolution. These are implemented in a crystal plasticity framework using the Los Alamos viscoplastic self-consistent code, VPSC-7. Presented here, the effects of simultaneous growth in multiple twin variants on textural evolution is tracked using a Kalidindi-type twin volume transfer scheme. In Task 1, the implementation of this scheme in order to simulate the texture of Twinning Induced Plasticity steels (TWIP) subjected to Equal Channel Angular Pressing (ECAP) are summarized. In Task 2, the hardening effects of two types of interactions between slip dislocations and encountered twin grain boundaries, namely dislocation transmutation and dissociation, are captured by way of modifying the dislocation density based hardening model of [11]. Interactions of the first type are presented in a constitutive relation calculating the amount of dislocation density apportioned to a given slip system contained within the encountered twin volume fraction from each interacting slip system in the parent volume fraction. The amount transmuted from each interacting slip system described using the Correspondence Method, an on to mapping of slip systems in a parent grain to slip systems in considered twin grains. Interactions of the second type are then introduced into this constitutive relation as a disassociation parameter, the value of which is established by observations gleaned from the results of the molecular dynamics simulations of [8] and [53]. These methods are implanted to simulate the anisotropic hardening behavior of HCP magnesium under multiple load paths
Hosseinzadeh, Delandar Arash. "Numerical Modeling of Plasticity in FCC Crystalline Materials Using Discrete Dislocation Dynamics." Licentiate thesis, KTH, Materialteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175424.
Full textQC 20151015
Wu, Xiaoxiang Verfasser], Gunther [Gutachter] Eggeler, and Dierk [Gutachter] [Raabe. "Elementary deformation processes during low temperature and high stress creep of Ni-base single crystal superalloys / Xiaoxiang Wu ; Gutachter: Gunther Eggeler, Dierk Raabe." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1129451925/34.
Full textWu, Xiaoxiang [Verfasser], Gunther Gutachter] Eggeler, and Dierk [Gutachter] [Raabe. "Elementary deformation processes during low temperature and high stress creep of Ni-base single crystal superalloys / Xiaoxiang Wu ; Gutachter: Gunther Eggeler, Dierk Raabe." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1129451925/34.
Full textRossiter, Angelina Jane. "Solubility and crystal growth of sodium nitrate from mixed alcohol – water solvents." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/505.
Full textSi, Xiuhua. "Applications of the thermodynamics of elastic, crystalline materials." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4177.
Full textWen, 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.
Full textLloyd, Jeffrey T. "Microstructure-sensitive simulation of shock loading in metals." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51853.
Full textMurtagian, Gregorio Roberto. "Surface integrity on grinding of gamma titanium aluminide intermetallic compounds." Diss., Available online, Georgia Institute of Technology, 2005, 2004. http://etd.gatech.edu/theses/available/etd-08192004-181021/unrestricted/murtagian%5Fgregorio%5Fr%5F200412%5Fphd.pdf.
Full textAshok Saxena, Committee Member ; Carlos Santamarina, Committee Member ; Thomas Kurfess, Committee Member ; Hugo Ernst, Committee Member ; Steven Danyluk, Committee Chair ; David McDowell, Committee Member. Vita. Includes bibliographical references.
Lin, Chuang-Chia 1968. "Cyclic deformation of FCC crystals." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37757.
Full textKerch, Johanna Katharina [Verfasser], and Olaf [Akademischer Betreuer] Eisen. "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities / Johanna Katharina Kerch ; Betreuer: Olaf Eisen." Heidelberg : Universitätsbibliothek Heidelberg, 2016. http://d-nb.info/1180738020/34.
Full textUtada, Satoshi. "Effect of a Prior Plastic Deformation during Heat Treatments on the Mechanical Properties of Ni-Based Superalloys for Turbine Blade Application Evolution of superalloy for turbine airfoil and development of recycling technology Platinum containing new generation nickel-based superalloy for single crystalline application Tensile, low cycle fatigue and very high cycle fatigue characterizations of advanced single crystal nickel-based superalloys Creep Property and Phase Stability of Sulfur-Doped Ni-Base Single-Crystal Superalloys and Effectiveness of CaO Desulfurization Evaluation and comparison of damage accumulation mechanisms during non-isothermal creep of cast Ni-based superalloys." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0019.
Full textNi-based single crystal (SX) superalloys are used for turbine blade applications because of their high-temperature durability. During the production of a turbine blade, unexpected plastic deformation (PD) can be introduced to the material. In this study, SX materials were pre-deformed in between solution and aging heat treatments to mimic PD during production. Mechanical tests on the pre-deformed materials have been performed to understand the effect of the prior PD.During aging treatments of pre-deformed AM1 SX superalloy, faster coarsening of γ′ precipitates and enhanced void nucleation were observed in the vicinity of slip bands which were introduced by PD at room-temperature. During creep deformation of pre-deformed AM1 at high temperature/low stress conditions (≥ 950 °C), the microstructure coarsened bands act as diffusion induced creep damage accumulating paths, further triggering recrystallization and resulting in drastic reduction of creep properties. At low temperature/high stress conditions (≤ 850 °C), microstructure shearing was facilitated in the microstructure coarsened band and it decreased creep properties. Recrystallization was not observed at lower temperature creep because the diffusion damage was suppressed. These relationships have been explained by creep tests on pre-deformed materials prepared by different pre-deformation temperatures and heat treatment procedures.CMSX-4 Plus SX superalloy was tested similarly to AM1 to understand the effect of the chemical composition. Effect of pre-deformation on alloy’s microstructure was mild in CMSX-4 Plus compared to that in AM1. Therefore, the predeformation did no exhibit large creep life debit in CMSX-4 Plus at temperatures lower than 1050 °C. However, during creep of CMSX-4 Plus at 1150 °C, pre-deformation presented huge impact on creep life and ductility by the same mechanisms as the ones observed for AM1 at 1050 °C.In order to restore properties of pre-deformed SX superalloys, rejuvenation heat treatment was added after PD.Rejuvenation treatment successfully restored microstructure after PD at room-temperature, and creep properties of rejuvenated specimens were shown to be equivalent to that of original AM1 and CMSX-4 Plus without PD
Choudhury, Anshuman. "Statistics of dislocations at low temperature in pure metals with body centered cubic symmetry." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS569/document.
Full textIn situ straining tests in high purity α-Fe thin-foils at low temperatures have demonstrated that crystalline defects, called dislocations, have a jerky type of motion made of intermittent long jumps of several nanometers. Such an observation is in conflict with the standard Peierls mechanism for plastic deformation in bcc crystals, where the screw dislocation jumps are limited by inter-reticular distances, i.e. of a few Angstroms. Employing atomic-scale simulations, we show that although the short jumps are initially more favorable, their realization requires the propagation of a kinked profile along the dislocation line which yields coherent atomic vibrations acting as traveling thermal spikes. Such local heat bursts favor the thermally assisted nucleation of new kinks in the wake of primary ones. The accumulation of new kinks leads to long dislocation jumps like those observed experimentally. Our study constitutes an important step toward predictive atomic-scale theory for materials deformation
Smith, Benjamin Daniel. "Microstructure-sensitive plasticity and fatigue of three titanium alloy microstructures." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49237.
Full textDunne, Barry John. "Structural deformations in phosphorus and nitrogen complexes." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.346442.
Full textNg, 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.
Full textZamiri, Amir Reza. "Computationally efficient crystal plasticity models for polycrystalline materials." Diss., Connect to online resource - MSU authorized users, 2008.
Find full textChieragatti, Rémy. "Influence de l'orientation cristallographique sur le comportement en fatigue oligocyclique du mar-m200 monocristallin." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0024.
Full textNg, 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.
Full textRiss, Joëlle. "Principes de stéréologie des formes en pétrographie quantitative." Orléans, 1988. http://www.theses.fr/1988ORLE2015.
Full textAbu-Saman, Awni. "Large plastic deformation and shear localization of crystals." Doctoral thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/4954.
Full textPoston, Edward J. "Experimental Deformation of O+ Oriented Synthetic Quartz Single Crystals." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491569717148234.
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