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Dissertations / Theses on the topic 'Metal grain boundary diffusion'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Moon, D. P. "Studies of segregation at interfaces." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379916.

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2

Xu, Lei. "Controlling interfacial reaction in aluminium to steel dissimilar metal welding." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/controlling-interfacial-reaction-in-aluminium-to-steel-dissimilar-metal-welding(721d3009-de49-434c-bd81-b01ff5973706).html.

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Two different aluminium alloys, AA6111 (Al-Mg-Si) and AA7055 (Al-Mg-Zn), were chosen as the aluminium alloys to be welded with DC04, and two welding methods (USW and FSSW) were selected to prepare the welds. Selected pre-welded joints were then annealed at T=400 - 570oC for different times. Kinetics growth data was collected from the microstructure results, and the growth behaviour of the IMC layer was found to fit the parabolic growth law. A grain growth model was built to predict the grain size as a function of annealing time. A double-IMC phase diffusion model was applied, together with gra

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3

Garcia, de la Cruz Lucia. "Ultrafine grained nickel processed by powder metallurgy : microstructure, mechanical properties and thermal stability." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC224.

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La synthèse par métallurgie des poudres de nickel à grains ultrafins (UFG) a été effectuée, et l’effet de l’affinement de la microstructure sur le comportement mécanique et les propriétés physiques a été étudié. La possibilité de coupler le broyage et le frittage flash est étudiée avec des résultats prometteurs. Des échantillons de haute densité avec des tailles de grains d = 0.65 – 4 µm, caractérisés par une fraction élevée des joints de grains Σ3 et un faible niveau de contrainte ont été synthétisés. Les propriétés mécaniques des échantillons UFG montrent une bonne combinaison ductilité-rési

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4

Meredith, Steven L. "CHARACTERIZATION OF A VISCOELASTIC RESPONSE FROM THIN METAL FILMS DEPOSITED ON SILICON FOR MICROSYSTEM APPLICATIONS." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/53.

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Understanding the mechanisms that control the mechanical behavior of microscale actuators is necessary to design an actuator that responds to an applied actuation force with the desired behavior. Micro actuators which employ a diaphragm supported by torsional hinges which deform during actuation are used in many applications where device stability and reliability are critical. The material response to the stress developed within the hinge during actuation controls how the actuator will respond to the actuating force. A fully recoverable non-linear viscoelastic response has been observed in

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5

Heiser, Thomas. "Developpement d'une technique d'analyse localisee des defauts electriquement actifs dans les semiconducteurs." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13136.

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Methode basee sur l'emission thermique de porteurs electriques pieges par les niveaux profonds dans la bande interdite. La modelisation de la technique a permis de determiner l'influence des divers parametres physiques sur la resolution spatiale de la technique et d'etablir les conditions optimales de mesures. L'exploitation numerisee des signaux augmente sensiblement la capacite de detection de la technique. Le phenomene de "gettering" de l'or par les dislocations ainsi que la diffusion acceleree de l'or a travers le joint de grain d'un bicristal de silicium ont ete mis en evidence

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6

Ihlal, Ahmed. "Analyses quantitatives par sem/ebic des defauts recombinants dans les semiconducteurs polycristallins : influence des traitements thermiques sur l'activite electrique des bicristaux de silicium." Caen, 1988. http://www.theses.fr/1988CAEN2007.

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Etude quantitative , par la methode ebic, de la recombinaison des porteurs minoritaires dans des bicristaux de silicium en fonction des traitements thermiques, entre 450 et 950**(o)c. Un developpement des phenomenes physiques regissant la creation de differentes theories conduisant au traitement quantitatif du signal ebic est presente. Selon le traitement thermique, le contraste des deux types de joints de grains evolue avec la temperature: vitese de recombinaison et longueur de diffusion varient avec la temperature de recuit

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7

Gryaznov, Denis, Juergen Fleig, and Joachim Maier. "Numerical study of grain boundary diffusion." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-195828.

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8

Gryaznov, Denis, Juergen Fleig, and Joachim Maier. "Numerical study of grain boundary diffusion: size effects." Diffusion fundamentals 2 (2005) 49, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14382.

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9

Hiscock, Matthew John. "Importance of grain boundary diffusion : an experimental study." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8882.

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This research is concerned with the mechanisms of diffusion in the Earth and the implications of such an understanding. Specifically, this work is concerned with one particular aspect of diffusion: Grain Boundary Diffusion (GBD). An experimental investigation of GBD has been conducted by considering three specific scenarios; GBD of H in stoichiometric Mg-spinel, GBD of Ti in Quartz and GBD of Li in olivine. By considering the GBD of three very different elements it has been possible to synthesise an understanding of some of the mechanisms involved in the process. GBD is potentially a very impo

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10

Swaroop, Sathya, Martin Kilo, Christos Argirusis, Günter Borchardt, and Atul H. Chokshi. "Lattice and grain boundary diffusion of cations in tetragonal zirconia." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194753.

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11

Swaroop, Sathya, Martin Kilo, Christos Argirusis, Günter Borchardt, and Atul H. Chokshi. "Lattice and grain boundary diffusion of cations in tetragonal zirconia." Diffusion fundamentals 3 (2005) 13, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A13251.

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12

Soule, de Bas Benjamin J. "Simulation of Bulk and Grain Boundary Diffusion in B2 NiAl." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33352.

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Molecular dynamics simulations of the diffusion process in ordered B2 compounds at high temperature were performed using an embedded atom interatomic potential developed to fit NiAl properties. Diffusion in the bulk occurs through a variety of cyclic mechanisms that accomplish the motion of the vacancy through nearest neighbor jumps restoring order to the alloy at the end of the cycle. The traditionally postulated six-jump cycle is only one of the various cycles observed and some of these are quite complex. Diffusion at the grain boundary mainly takes place through sequences of coordinated ne

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13

Iyer, Venkata Subramanian. "Diffusion induced grain boundary motion in the iron-zinc system /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487265143145921.

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14

Chung, Yong-Chae. "Toward the measurement of reliable grain-boundary diffusion coefficients in oxides." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38105.

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15

Pan, Zhenguo. "Simulation and analysis of coupled surface and grain boundary motion." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2733.

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At the microscopic level, many materials are made of smaller and randomly oriented grains. These grains are separated by grain boundaries which tend to decrease the electrical and thermal conductivity of the material. The motion of grain boundaries is an important phenomenon controlling the grain growth in materials processing and synthesis. Mathematical modeling and simulation is a powerful tool for studying the motion of grain boundaries. The research reported in this thesis is focused on the numerical simulation and analysis of a coupled surface and grain boundary motion which models the e

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16

Osman, Hoch Bachir. "Modelling of hydrogen diffusion in heterogeneous materials : implications of the grain boundary connectivity." Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS030/document.

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La diffusion de l’hydrogène dans les métaux est un paramètre clef pour la compréhension des mécanismes de base de la fragilisation par l’hydrogène. Néanmoins, le rôle des joints de grains dans le processus de diffusion de cet élément reste à éclaircir. Avec une approche numérique, nous avons étudié les effets d’un réseau hétérogène de joints de grains sur la diffusivité macroscopique de l’hydrogène. Pour cela, des essais de perméation ont été simulés par la méthode des éléments finis, en modélisant le matériau comme un composite formé d’une phase intra-associée aux grains et deux phases interg

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17

Nissley, Nathan Eugene. "Intermediate temperature grain boundary embrittlement in nickel-base weld metals." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1156949345.

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18

Liberatore, Michael James. "Secondary-ion mass spectrometric analysis of oxygen-grain boundary diffusion in magnesium-oxide bicrystals." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32163.

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19

Loginova, Irina. "Phase-field modeling of diffusion controlled phase transformations." Doctoral thesis, KTH, Mechanics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3626.

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<p>Diffusion controlled phase transformations are studied bymeans of the phase-field method. Morphological evolution ofdendrites, grains and Widmanst\"atten plates is modeled andsimulated.</p><p>Growth of dendrites into highly supersaturated liquids ismodeled for binary alloy solidification. Phase-field equationsthat involve both temperature and solute redistribution areformulated. It is demonstrated that while at low undercoolingheat diffusion does not affect the growth of dendrites, i.e.solidification is nearly isothermal, at high cooling rates thesupersaturation is replaced by the thermal u

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20

Westwood, Chris. "Computer simulation of diffusional creep failure of engineering alloys." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/843127/.

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A simplified model with only 2 degrees of freedom is developed for cavity growth along a grain-boundary by surface and grain-boundary diffusion following a similar model for a row of grains used by Sun et al, (1996). A variational principle for the coupled diffusion problem is used to follow the cavity growth. The approximate solution can be reduced to the well-established equilibrium cavity growth model at the fast surface diffusion extreme. By comparing the 2 degree of freedom model with the full finite element solution by Pan et al, (1997), a 'Validity Map' is constructed in terms of the re

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21

Li, Jiaqi. "The contribution of the grain boundary engineering to the problem of intergranular hydrogen embrittlement." Thesis, La Rochelle, 2017. http://www.theses.fr/2017LAROS037/document.

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La mobilité de l’hydrogène dans les métaux est un paramètre clef pour la compréhension des mécanismes de base de la fragilisation par l’hydrogène (FPH). Cette problématique est directement associée aux mécanismes de diffusion et de piégeage de l’hydrogène au sein d’un réseau cristallin. Ces derniers dépendent des diverses hétérogénéités microstructurales et en particulier des défauts cristallins présents au sein du matériau. Dans le cadre de nos travaux nous nous sommes restreints à étudier la diffusion et le piégeage de l’hydrogène au sein de deux systèmes élémentaires : des monocristaux et d

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22

Ma, Qing. "Effects of grain boundary structure on diffusion along [001] tilt boundaries in the Au/Ag system." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/17283.

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23

Juden, J. N. "Numerical solution of forced curvature flow for curves and a model for diffusion induced grain boundary motion." Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388973.

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24

CARNEIRO, VIVIANE DELVAUX. "RECIPITATION PROCESSES CONTROLLED BY LATTICE AND GRAIN BOUNDARY DIFFUSION IN ALLOY 33 (FE-NI-CR-MO-N)." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5927@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Este trabalho é uma investigação da microestrutura e cinética dos fenômenos de precipitação que ocorrem na Liga 33 (Fe-Ni-Cr-Mo-Cu-N), sistema metálico desenvolvido pela Krupp VDM com o intuito de suportar altas temperaturas e ambiente corrosivo. A Liga 33 incorre precipitação contínua e descontínua simultaneamente, como resultado do tratamento de envelhecimento realizado numa faixa de temperatura correspondente àquela que o material atinge quando submetido a um processo de soldagem. A caracterização microestrutural foi r

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25

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.

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Une approche couplée prenant en compte l’interaction de la plasticité cristalline et de la diffusion d’hydrogène a été établie et utilisée pour étudier le transport de l’hydrogène dans les agrégats polycristallins synthétiques de l’acier 316L avec des géométries de grains and des orientations cristallographiques différentes. Les champs mécaniques calculés à l’aide du code ZeBuLoN sont transférés dans un code de diffusion développé dans le cadre de ce travail. Une nouvelle formulation associée à un nouveau schéma numérique permet un calcul qui présente une bonne convergence. Les résultats des s

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26

Bhogireddy, Venkata Sai Pavan Kumar [Verfasser], Ingo [Gutachter] Steinbach, and Jörg [Gutachter] Neugebauer. "Liquid metal induced grain boundary embrittlement / Venkata Sai Pavan Kumar Bhogireddy ; Gutachter: Ingo Steinbach, Jörg Neugebauer." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1121909361/34.

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27

Zhang, Chaoqun. "Ultrasonic welding of aluminium to titanium : microstructure, properties, and alloying effects." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/ultrasonic-welding-of-aluminium-to-titanium-microstructure-properties-and-alloying-effects(1aaec7d7-19dd-4524-bde4-e6ffef5217a0).html.

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Use of welded titanium alloy to aluminium alloy structures in the aerospace industry has a number of potential benefits for both cost and weight saving by enabling titanium to be used only in the most critical parts, with the cheaper and lighter aluminum alloy making up the rest of the structure. However, due to the formation of brittle intermetallic compounds (IMC) at interface and the enormous gap in melting point, the welding of titanium to aluminium remains a major challenge. Solid state welding processes are most likely to be successful since they do not involve any melting, and so issues

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28

Thorning, Casper. "Grain Boundary Ridge Formation during High Temperature Oxiditation of Manganese Containing Steels." Doctoral thesis, KTH, Materialvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4778.

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29

Akyildiz, Oncu. "Computer Simulation Of Grain Boundary Grooving By Anisotropic Surface Drift Diffusion Due To Capillary, Electromigration And Elastostatic Forces." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612034/index.pdf.

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The aim of this study is to develop a theoretical basis and to perform computational experiments for understanding the grain boundary (GB) grooving in polycrystalline thin film metallic conductors (interconnects) by anisotropic surface diffusion due to capillary, electromigration and elastostatic forces. To this end, irreversible thermo&ndash<br>kinetics of surfaces and interfaces with triple junction singularities is elaborated, and the resulting well-posed moving boundary value problem is solved using the front&ndash<br>tracking method. To simulate the strain conditions of the interconnect

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30

Akyildiz, Oncu. "Computer Simulation Of Grain Boundary Grooving And Cathode Voiding In Bamboo Interconnects By Surface Diffusion Under Capillary And Electromigration Forces." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605302/index.pdf.

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The processes of grain boundary grooving and cathode voiding which are important in determining the life times of thin films connecting the transistors in an integrated circuit are investigated by introducing a new mathematical model, which flows from the fundamental postulates of irreversible thermodynamics, accounting for the effects of applied electric field and thermal stresses. The extensive computer studies on the triple junction displacement dynamics shows that it obeys the first order reaction kinetics at the transient stage, which is followed by the familiar time law as , in the norm

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31

Ozfidan, Asli Isil. "Ab Initio Modeling of Thermal Barrier Coatings: Effects of Dopants and Impurities on Interface Adhesion, Diffusion and Grain Boundary Strength." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19974.

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The aim of this thesis is to investigate the effects of additives, reactive elements and impurities, on the lifetime of thermal barrier coatings. The thesis consists of a number of studies on interface adhesion, impurity diffusion, grain boundary sliding and cleavage processes and their impact on the mechanical behaviour of grain boundaries. The effects of additives and impurity on interface adhesion were elaborated by using total energy calculations, electron localization and density of states, and by looking into the atomic separations. The results of these calculations allow the assessment

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32

Yang, Fan. "Quantitative Study Of Precipitate Growth In Ti-6al-4v Using The Phase Field Method." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211902429.

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33

Mukherjee, Arnab [Verfasser], and B. [Akademischer Betreuer] Nestler. "Electric field-induced directed assembly of diblock copolymers and grain boundary grooving in metal interconnects / Arnab Mukherjee ; Betreuer: B. Nestler." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1191267334/34.

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34

Delon, Rémi. "Incorporation et diffusion de l’hélium et de l’argon dans l’olivine polycristalline." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0207/document.

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Les gaz rares sont d’excellents traceurs des hétérogénéités géochimiques et isotopiques présentes dans le manteau terrestre. Cependant, le stockage et le transport de ces éléments dans les minéraux mantelliques restent mal compris. Cette thèse est centrée sur les sites de stockage de l’hélium et l’argon, et leurs mécanismes de diffusion dans les roches mantelliques. Des échantillons d’olivine polycristalline ont été dopés en hélium et argon à haute température (1150 ± 25 and 1050 ± 25 °C) et haute pression (0.30 ± 0.01 GPa), et analysés par chauffage par paliers de température avec un spectrom

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35

Kidd, Bryce Edwin. "Cation and Anion Transport in a Dicationic Imidazolium-Based Plastic Crystal Ion Conductor." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23300.

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Here we investigate the organic ionic plastic crystal (OIPC) 1,2-bis[N-(N\'-hexylimidazolium-d2(4,5))]C2H4 2PF6- in one of its solid plastic crystal phases by means of multi-nuclear solid-state (SS) NMR and pulsed-field-gradient (PFG) NMR. We quantify distinct cation and anion diffusion coefficients as well as the diffusion activation energies (Ea) in this dicationic imidazolium-based OIPC. Our studies suggest a change in transport mechanism for the cation upon varying thermal and magnetic treatment (9.4 T), evidenced by changes in cation and anion Ea. Moreover, variable temperature 2H SSNMR l

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36

Zhao, Hongwei. "Local tunneling characteristics near a grain boundary of a d-wave superconductor as probed by a normal-metal or a low-Tc-superconductor STM tip." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2373.

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We studied the local single-particle tunneling characteristics [as observed with scanning tunnel microscopy (STM)] for N D and S D tunneling, where N is a normal metal, S is a s-wave superconductor, and D is a d-wave superconductor with a {100} | {110} grain boundary. The tunneling Hamiltonian method was used. The self-consistent order parameter is first determined using the quasiclassical Green'sfunction method, and then the tunneling characteristics at various distances from the interface, reectivity of the interface, and temperature are studied. For N D tunneling, a zero-bias conducta

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37

Kuper, Michael W. "Investigations Near the Fusion Boundary of Grade 91 Steel Dissimilar Metal Welds with Nickel Based Filler Metals." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543505600533312.

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38

Hashim, Leïla. "Unraveling the grain size evolution in the Earth’s upper mantle : experimental observations and theoretical modeling." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2025/document.

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La taille de grains dans le manteau terrestre a des implications cruciales sur les processus à grande échelle, telles que la propagation des ondes sismiques, la perméabilité et la rhéologie des roches. Cependant, la taille de grains évolue constamment avec le temps, car la croissance de grains statique induit une augmentation de la taille moyenne tandis que la recristallisation dynamique contribue à sa décroissance. La croissance d’olivine au sein d’agrégats mantelliques dans un milieu inter-granulaire sec, en présence de liquide magmatique ou dans des conditions sursaturées en eau a été modél

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39

Hamm, Magnus Verfasser], Astrid [Akademischer Betreuer] Pundt, Astrid [Gutachter] Pundt, et al. "Hydrogen diffusion and hydride formation in grain boundary rich magnesium / Magnus Hamm ; Gutachter: Astrid Pundt, Reiner Kirchheim, Cynthia Volkert, Vasily Moshnyaga, Hans Christian Hofsäss, Michael Seibt ; Betreuer: Astrid Pundt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/118575749X/34.

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Hamm, Magnus [Verfasser], Astrid Akademischer Betreuer] Pundt, Astrid [Gutachter] Pundt, et al. "Hydrogen diffusion and hydride formation in grain boundary rich magnesium / Magnus Hamm ; Gutachter: Astrid Pundt, Reiner Kirchheim, Cynthia Volkert, Vasily Moshnyaga, Hans Christian Hofsäss, Michael Seibt ; Betreuer: Astrid Pundt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/118575749X/34.

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41

Bertali, Giacomo. "Mechanistic understanding of Alloy 600 preferential intergranular oxidation : 'precursor events of stress corrosion cracking'." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/mechanistic-understanding-of-alloy-600-preferential-intergranular-oxidation-precursor-events-of-stress-corrosion-cracking(db6c7668-7cf5-4d50-a6bf-34eacf5b1216).html.

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Primary Water Stress Corrosion Cracking (PWSCC) of Alloy 600 and similar Ni-Cr-Fe alloys is regarded as one of the most important challenges to nuclear power plant operation. During the past decades the majority of research has focused on PWSCC crack growth rate measurements in order to assess the lifetime of real components and to develop empirical models for crack propagation. However, the incubation and initiation stages of PWSCC have the same or even greater importance than the propagation stage, particularly because SCC can be undetected for more than 20 years before the occurrence of a r

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42

Breitwieser, Matthias, Friedemann D. Heinz, Andreas Büchler, et al. "Analysis of solar cell cross sections with micro-light beam induced current (µLBIC)." Elsevier, 2014. https://publish.fid-move.qucosa.de/id/qucosa%3A72456.

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A highly resolving micro-light beam-induced current (µLBIC)-system is presented in this work. Based on the laser excitation via an optical microscope, current values can be measured with sub-micron precision. We show, that this non-destructive, light-based approach delivers superior results to a reference electron microscope based electron beam induced current method concerning contrast and robustness towards reflection differences, whereas no vacuum is needed, no charging effects can occur and equal resolution is achieved. µLBIC allows therefore mapping of pn-junctions at silicon solar cell c

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43

Fliegans, Jérôme. "Coercivity of NdFeB-based sintered permanent magnets : experimental and numerical approaches." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY071.

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Les aimants permanents Nd-Fe-B sont actuellement les plus puissants du marché. Ils sont indispensables pour des applications telles que les moteurs des véhicules électriques ou les générateurs des éoliennes. Leurs propriétés exceptionnelles viennent des propriétés magnétiques intrinsèques de la phase Nd2Fe14B et de leur microstructure. Cependant, les machines électriques fonctionnent entre 120 et 180°C et les propriétés magnétiques extrinsèques telles que la coercitivité et la rémanence diminuent avec la température. Un moyen d’améliorer la coercitivité des aimants frittés Nd-Fe-B est la subst

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44

Kajbaji, Mohamed El. "Etude du joint de grain [SIGMA] = 9 dans le silicium parfait, déformé et recuit par microscopie électronique à haute résolution." Grenoble 1, 1986. http://www.theses.fr/1986GRE10102.

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Etude des mecanismes d'interaction joint de grain dislocations lors de la deformation du bicristal, mettant en evidence la dissociation des dislocations entrant dans le joint, leur perte d'identite et l'interaction entre eux des residus. Determination des structures des dislocations residuelles. Apparition de precipites lors du recuit du bicristal deforme

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Riet, Adriaan Anthony. "INVESTIGATION OF DEFECT-ASSISTED MATERIAL TRANSPORT IN MAGNESIUM OXIDE BY MOLECULAR SIMULATIONS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1592306263843628.

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Rouvière, Jean-Luc. "Structure atomique des joints de grains de flexion d'axe <001> dans le silicium et le germanium." Grenoble 1, 1989. http://www.theses.fr/1989GRE10010.

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Etude de cinq joints de grains de flexion d'axe 001, de grande coincidence (sigma=5, 65, 13, 25 et 41) par microscopie electronique haute resolution et relaxation numerique. Presentation d'une analyse en termes d'unites structurales-dislocation

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Hagège, Serge. "Contribution a l'etude des joints de grains en coincidence dans la symetrie hexagonale." Caen, 1985. http://www.theses.fr/1985CAEN2019.

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Les joints de grains peuvent etre decrits comme des joints en relation d'orientations de coincidence. Cette description necessite l'introduction d'une serie de parametres necessaires et suffisants pour caracteriser completement la relation d'orientation. Le rapport c/a de la symetrie hexagonale introduit une difficulte supplementaire qui conduit a discuter de la dimension de la coincidence et a envisager la notion de coincidence approchee. Applications aux macles de deformation des metaux hexagonaux compacts que l'on peut decrire comme des joints de coincidence. La notion de symetrie permet de

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Nguejio, Nguimatsia Josiane. "Processus diffusionnels à l'origine de l'évolution de la composition d’un alliage au cours de l'oxydation sélective en pointe de fissures intergranulaires. Application à la CSC de l'Alliage 600 en milieu primaire des REP." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM054/document.

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La corrosion sous contrainte (CSC) des alliages à base nickel est un des principaux phénomènes de dégradation des composants du circuit primaire des Réacteurs à Eau Pressurisée (REP). La compréhension de ce mécanisme de fissuration est un élément essentiel pour la prolongation de la durée d’exploitation des réacteurs.Des études antérieures ont permis d’établir un modèle de propagation de la CSC basé sur une oxydation sélective et dissymétrique du joint de grains en pointe de fissure qui s’accompagne d’une zone appauvrie en chrome. La cinétique de diffusion du chrome étant plus lente que celle

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Tao, Liang. "Atomic-scale calculations of interfacial structures and their properties in electronic materials." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1127163029.

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Spirig, John Vincent. "A new generation of high temperature oxygen sensors." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1188570727.

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