Relevant bibliographies by topics / Plasticity of bcc materials

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Academic literature on the topic 'Plasticity of bcc materials'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Plasticity of bcc materials"

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Aragon, Nicole K., Sheng Yin, Hojun Lim, and Ill Ryu. "Temperature dependent plasticity in BCC micropillars." Materialia 19 (September 2021): 101181. http://dx.doi.org/10.1016/j.mtla.2021.101181.

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Yang, Mei, Xiao Yan Zhang, and Hao Wang. "Forming Limit Prediction of BCC Materials under Non-Proportional Strain-Path by Using Crystal Plasticity." Applied Mechanics and Materials 201-202 (October 2012): 1110–16. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.1110.

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In this paper, the forming limit of a body-centered cubic (BCC) sheet metal under non-proportional strain-path is investigated by using the Marciniak and Kuczynski approach integrated with a rate-dependent crystal plasticity model. The prediction model has been proved to be effective in predicting Forming Limit Diagram (FLD) of anisotropic sheet metal with FCC type of slip systems[1]. The same model has been used to study the FLD under non-proportional strain-path of BCC slip systems numerically and experimentally. The agreement between the experiments and simulations is good. With crystal plasticity model well describing the crystal microstructure effect, our model can be used to predict the FLD of BCC sheet metal under complicated strain path in plastic forming process with good accuracy.
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Yu, Haiyang, Alan Cocks, and Edmund Tarleton. "Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials." Journal of the Mechanics and Physics of Solids 123 (February 2019): 41–60. http://dx.doi.org/10.1016/j.jmps.2018.08.020.

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Wang, Zhenhua, Dongming Jin, Jincan Han, Qing Wang, Zhongwei Zhang, and Chuang Dong. "Microstructures and Mechanical Properties of Al-Ti-Zr-Nb-Ta-Mo-V Refractory High-Entropy Alloys with Coherent B2 Nanoprecipitation." Crystals 11, no. 7 (2021): 833. http://dx.doi.org/10.3390/cryst11070833.

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In this work, the microstructural evolution and mechanical properties of new body-centered cubic (BCC)-based Al-Ti-Zr-Nb-Ta-Mo-V refractory high-entropy alloys (RHEAs) with coherent B2 precipitation are investigated. These designed alloy ingots were solid-solutionized at 1573 K for 2 h and then aged at 873 K for 24 h, in which each treatment was followed by water quenching. It was found that there exists phase separation of BCC matrix, Ti/Zr-rich BCC1 and Nb/Ta-rich BCC2 in these alloys. Moreover, ultra-fine spherical B2 nanoparticles with a size of 3~5 nm were dispersed in BCC2 matrix. These B2 nanoparticles could be coarsened up to 25~50 nm after aging and the particle morphology also changes to a cuboidal shape due to a moderate lattice misfit (ε = 0.7~2.0%). Also, Zr5Al3 phase could coexist with the B2 phase, where the difference between them is that the Ti element is enriched in B2 phase, rather than in Zr5Al3. Among them, the solutionized Al2Ti5Zr4Nb2.5Ta2.5 RHEAs exhibit good compressive mechanical property with a high yield strength of 1240 MPa and a large plasticity, which is mainly attributed to the coherent precipitation in the BCC matrix.
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Sainath, G., Sunil Goyal, and A. Nagesha. "Plasticity through De-Twinning in Twinned BCC Nanowires." Crystals 10, no. 5 (2020): 366. http://dx.doi.org/10.3390/cryst10050366.

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The deformation behaviour of twinned FCC nanowires has been extensively investigated in recent years. However, the same is not true for their BCC counterparts. Very few studies exist concerning the deformation behaviour of twinned BCC nanowires. In view of this, molecular dynamics (MD) simulations have been performed to understand the deformation mechanisms in twinned BCC Fe nanowires. The twin boundaries (TBs) were oriented parallel to the loading direction [110] and the number of TBs is varied from one to three. MD simulation results indicate that deformation under the compressive loading of twinned BCC Fe nanowires is dominated by a unique de-twinning mechanism involving the migration of a special twin–twin junction. This de-twinning mechanism results in the complete annihilation of pre-existing TBs along with reorientation of the nanowire. Further, it has been observed that the annihilation of pre-existing TBs has occurred through two different mechanisms, one without any resolved shear stress and other with finite and small resolved shear stress. The present study enhances our understanding of de-twinning in BCC nanowires.
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Yalcinkaya, T., W. A. M. Brekelmans, and M. G. D. Geers. "BCC single crystal plasticity modeling and its experimental identification." Modelling and Simulation in Materials Science and Engineering 16, no. 8 (2008): 085007. http://dx.doi.org/10.1088/0965-0393/16/8/085007.

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Ma, A., F. Roters, and D. Raabe. "A dislocation density based constitutive law for BCC materials in crystal plasticity FEM." Computational Materials Science 39, no. 1 (2007): 91–95. http://dx.doi.org/10.1016/j.commatsci.2006.04.014.

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Kaufmann, D., A. S. Schneider, R. Mönig, C. A. Volkert, and O. Kraft. "Effect of surface orientation on the plasticity of small bcc metals." International Journal of Plasticity 49 (October 2013): 145–51. http://dx.doi.org/10.1016/j.ijplas.2013.03.004.

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Xiong, Zhiping, David R. G. Mitchell, Ahmed A. Saleh, and Elena V. Pereloma. "Tetragonality of bcc Phases in a Transformation-Induced Plasticity Steel." Metallurgical and Materials Transactions A 49, no. 12 (2018): 5925–29. http://dx.doi.org/10.1007/s11661-018-4932-5.

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Katiyar, T., and E. Van der Giessen. "Effective mobility of BCC dislocations in two-dimensional discrete dislocation plasticity." Computational Materials Science 187 (February 2021): 110129. http://dx.doi.org/10.1016/j.commatsci.2020.110129.

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Dissertations / Theses on the topic "Plasticity of bcc materials"

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Patra, Anirban. "Modeling the mechanical behavior and deformed microstructure of irradiated BCC materials using continuum crystal plasticity." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50366.

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The mechanical behavior of structural materials used in nuclear applications is significantly degraded as a result of irradiation, typically characterized by an increase in yield stress, localization of inelastic deformation along narrow dislocation channels, and considerably reduced strains to failure. Further, creep rates are accelerated under irradiation. These changes in mechanical properties can be traced back to the irradiated microstructure which shows the formation of a large number of material defects, e.g., point defect clusters, dislocation loops, and complex dislocation networks. Interaction of dislocations with the irradiation-induced defects governs the mechanical behavior of irradiated metals. However, the mechanical properties are seldom systematically correlated to the underlying irradiated microstructure. Further, the current state of modeling of deformation behavior is mostly phenomenological and typically does not incorporate the effects of microstructure or defect densities. The present research develops a continuum constitutive crystal plasticity framework to model the mechanical behavior and deformed microstructure of bcc ferritic/martensitic steels exposed to irradiation. Physically-based constitutive models for various plasticity-induced dislocation migration processes such as climb and cross-slip are developed. We have also developed models for the interaction of dislocations with the irradiation-induced defects. A rate theory based approach is used to model the evolution of point defects generated due to irradiation, and coupled to the mechanical behavior. A void nucleation and growth based damage framework is also developed to model failure initiation in these irradiated materials. The framework is used to simulate the following major features of inelastic deformation in bcc ferritic/martensitic steels: irradiation hardening, flow localization due to dislocation channel formation, failure initiation at the interfaces of these dislocation channels and grain boundaries, irradiation creep deformation, and temperature-dependent non-Schmid yield behavior. Model results are compared to available experimental data. This framework represents the state-of-the-art in constitutive modeling of the deformation behavior of irradiated materials.
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Raja, Daniel Selvakumar. "Dependence of Initial Grain Orientation on the Evolution of Anisotropy in FCC and BCC Metals Using Crystal Plasticity and Texture Analysis." Thesis, Southern Illinois University at Edwardsville, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1597933.

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<p>Abundant experimental analyses and theoretical computational analyses that had been performed on metals to understand anisotropy and its evolution and its dependence on initial orientation of grains have failed to provide theories that can be used in macro-scale plasticity. Ductile metals fracture after going through a large amount of plastic deformation, during which the anisotropy of the material changes significantly. Processed metal sheets or slabs possess anisotropy due to textures produced by metal forming processes (such as drawing, bending and press braking). Metals that were initially isotropic possess anisotropy after undergoing forming processes, <i>i.e</i>., through texture formation due to large amount of plastic deformation before fracture. It is therefore essential to consider the effect of anisotropy to predict the characteristics of fracture and plastic flow performances in the simulation of ductile fracture and plastic flow of materials. Crystal plasticity simulations carried out on grains at the meso-scale level with different initial orientations (ensembles) help to derive the evolution of anisotropy at the macro-scale level and its dependence on initial orientation of grains. This paper investigates the evolution of anisotropy in BCC and FCC metals and its dependence on grain orientation using crystal plasticity simulations and texture analysis to reveal the mechanics behind the evolution of anisotropy. A comparison of anisotropy evolution between BCC and FCC metals is made through the simulation, which can be used to propose the theory of anisotropy evolution in macro-scale plasticity. </p><p> <i>Keywords</i>: ensembles; grains; initial orientation; anisotropy; evolution of anisotropy; crystal plasticity; textures; homogeneity; isotropy; inelastic; equivalent strain </p>
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Gaspard, Vincent. "Interactions Hydrogène – Plasticité dans les Alliages Ferritiques." Thesis, Saint-Etienne, EMSE, 2014. http://www.theses.fr/2014EMSE0730/document.

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Le développement à grande échelle des projets de véhicules électriques à pile àcombustible nécessite le déploiement d’infrastructures de transport et de stockaged’Hydrogène gazeux. La conception de ces structures et la sélection des matériaux nécessitede s’affranchir des risques liés à la fragilisation par l’Hydrogène des alliages métalliques. Cephénomène est bien décrit depuis plusieurs décennies, mais les mécanismes élémentaires àl’origine de ce mode d’endommagement restent controversés, notamment par manque demodèles quantitatifs. Plus précisément, le rôle de la déformation (micro-)plastique en pointede défaut sur le piégeage et l’endommagement par l’hydrogène, s’il est bien démontréexpérimentalement dans de nombreux systèmes, reste mal pris en compte dans les modèlesmicro-mécaniques. Le centre SMS de l’ENSM.SE a proposé des approches originales demodélisation des interactions hydrogène – dislocations, qui ont pu être validéesexpérimentalement dans des matériaux modèles de structure cubique à faces centrées. Cette thèsese propose d’appliquer une démarche semblable dans des alliages de structure cubiquecentrée. On mettra en oeuvre des essais de déformation sur des matériaux modèles pré-chargésen hydrogène, des modèles semi-analytiques et des observations des structures de déformationen microscopie électronique à transmission<br>The development of electrical vehicles powered by hydrogen fuel cells requires the large scaledeployment of hydrogen storage and transport infrastructures. This in turn requires theassessment of the sensitivity of structural materials to hydrogen embrittlement phenomena.These damage modes, while being well described experimentally for since several decades,are still highly debated when it comes to elementary physical processes, mainly because of thelack of quantitative models for these elementary processes. More precisely, the role of the(micro-)plasticity developing at the tip of structural defects, while being well establishedexperimentally, is still poorly accounted for in the available micro-mechanical models. TheScience of Materials and Structures division of ENSM.SE already proposed originalmodelling approaches for hydrogen – dislocation interactions, that have been experimentallyvalidated in face-centred cubic materials. This project aims at applying the same type ofapproach to body-centred cubic metals. This will be achieved by means ofdeformation tests on hydrogen-charged model body centred cubic alloys, investigations of thedislocation microstructures by transmission electron microscopy and the development ofsemi-analytical models of hydrogen-dislocation interactions
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Tsai, Joshua Jr-Syan. "Micromechanisms of Near-Yield Deformation in BCC Tantalum." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/8906.

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New materials, optimized for increased strength, ductility, and other desirable properties, have the potential to improve every aspect of modern living. To achieve these optimums, the necessary technological advancements are impeded mainly by the limits of available material models. Innovations in this field rely on research into the nature of material behavior. While a typical model of material behavior in the region near yield involves the initial linear elastic response, followed by yield and isotropic hardening, this fails to explain various important phenomena that manifest in a range of materials, such as pre-yield nonlinearity, anelasticity, yield point phenomena, hardening stagnation, and the Bauschinger effect. These effects have been explained over the past century with the theories of Cottrell atmospheres, the Orowan by-pass mechanism, and back stress. This manuscript compares data from experimental observation in tantalum to these theories to better understand the micromechanisms occurring near yield. Understanding deformation in this region has significant implications in structural and mechanical engineering, as well has having direct applications in the forming of metals. Forty-four dogbone-shaped samples were cut from 99.99% pure tantalum and pulled in load-unload-load and multi-cycle loop tensile tests at room temperature. The specimens were either single crystal, whose orientations were chosen based on desired active slip mode determined by Schmid factors, or bicrystal, based on the orientation of the single grain boundary. Sample behavior was simulated in both crystal plasticity and General Mesoscale finite element models to assist in interpreting results and in suggesting plausible micromechanisms. The experimental results and crystal plasticity simulations suggest alternate explanations to some of the discussed mechanical theories of near-yield deformation. The combined experimental / modeling approach indicates that other slip systems, besides the conventionally assumed {110}, are activated upon yield; particularly the {112} system. The breakaway model traditionally associated with the yield point phenomenon may also be better explained through a different mechanism; back stress development during deformation is shown to result in the observed behavior. Lastly, as is well-known, the Taylor formulation, upon which most crystal plasticity models are based, does not adequately predict yield stress behavior in the presence of grain boundaries; once again, an internal stress mechanism matches much better with the experimental results on single and bicrystals. While not all observations could be fully explained by simply adding internal stress generation to a standard crystal plasticity model, this work anticipates further studies to enable more accurate predictive modeling capabilities and increase understanding of the mechanisms driving the fundamental material properties necessary for future progress.
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Wang, Guofeng Goddard William A. Johnson W. L. "First principles based multiscale modeling of single crystal plasticity application to BCC tantalum /." Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechTHESIS:11132009-112545862.

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Thesis (Ph. D.)--California Institute of Technology, 2010. PQ #3052851.<br>Advisor names found in the Acknowledgements pages of the thesis. Title from home page. Viewed 01/13/2010. Includes bibliographical references.
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Howie, Philip Robert. "Measuring plasticity in brittle materials." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610682.

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Varillas, Javier. "A molecular dynamics study of nanocontact plasticity and dislocation avalanches in FCC and BCC crystals." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667172.

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This study aims to investigate the underlying mechanisms which govern the development of dense defect networks in nanoscale crystal plasticity, either under contact and uniaxial loading conditions, with emphasis on the onset of intermittent avalanche phenomena. The investigation is based on a comprehensive set of massive molecular dynamics (MD) simulations performed with embedded-atom method potentials in face-centered cubic (FCC) and body-centered cubic (BCC) crystals. The first part of the thesis concerns the combined role of elasticity and plasticity in nanocontact loadings, where attention is given to the mechanisms leading to the formation of a permanent nanoimprint as well as to the onset of material pile-up at the contact vicinity. It is found that the topographical arrangement of the slip traces emitted at the surface into specific deformation patterns is a distinctive feature of the underlying dislocation glide and twinning processes occurring in FCC and BCC crystals as a function of temperature and surface orientation. A mechanistic analysis is made on the influence of the defect nucleation events in conjunction with the development of entangled defect networks upon the material hardness and its evolution towards a plateau level with increasing indenter-tip penetration. Complementary MD simulations of the uniaxial stress-strain curve of the plastically deformed region are carried out with the purpose of establishing a direct correlation between nanoscale material responses attaining under uniaxial and contact loading conditions. The results of this comparison illustrate on the key role played by defect nucleation processes on the formation of permanent nanoimprints, which differs from the conventional view in that in micro and macroscopic scales imprint formation is essentially governed by the evolutionary character of a preexisting (entangled) defect network: the greater the dislocation density, the larger the measured hardness. In overall, this work provides a fundamental insight into the understanding of why BCC surfaces are harder than FCC surfaces at the nanoscale. A statistical physics background is devised to investigate the influence of the dislocation mechanisms on the onset of avalanche events that are inherent to crystal plasticity. The analysis is predicated upon the notion in that the size distribution of such avalanches follows power-law scaling. To investigate the avalanche size distributions in cubic crystals, a group of novel MD simulations are performed where the computational cells containing a periodic arrangement of a preexisting dislocation network are subjected to uniaxial straining under displacement control at different strain rates and temperatures. Under sufficiently slow driving, the dislocation networks evolve through the emission of dislocation avalanches which do not overlap in time. This illustrates that the mobilized entangled dislocation arrangements exhibit quiescent periods during each plastic (dissipative) event, enabling comparison with experimental results which are also performed under strict displacement controlled conditions. The results illustrate on the attainment of a transitional slip size separating two power-law avalanche regimes as a function of the fundamental dislocation glide processes at the crossroads of self-organized and tuned criticality models. Detailed analyses of the MD simulations furnish specific mechanisms characterizing dislocation avalanche emission and propagation in FCC and BCC metals throughout a wide temperature range, which is central in supporting the onset of the aforementioned two power-law regimes.<br>En este estudio se investigan los mecanismos fundamentales para el desarrollo de las densas redes de defectos que se producen durante la deformación plástica de metales mediante ensayos uniaxiales y de indentación en escalas nanométricas. Estos procesos de deformación plástica se caracterizan por la producción de eventos intermitentes o avalanchas de dislocaciones. La investigación se basa en un extenso grupo de simulaciones de dinámica molecular en las que se emplean potenciales interatómicos del tipo embedded-atom method en cristales cúbicos centrados en las caras (CCC) y cúbicos centrados en el cuerpo (CC). La primera parte de esta tesis discute el papel combinado de la elasticidad y plasticidad en los nanocontactos. Se presta una especial atención a los mecanismos que llevan a la formación de nanohuellas plásticas así como al desarrollo de apilamiento de material alrededor del nanocontacto. Se encuentra que los arreglos topográficos de trazas de deslizamiento (emitidas a la superficie) muestran patrones específicos de deformación, los cuales son a su vez un rasgo distintivo de los mecanismos de deslizamiento de dislocaciones y procesos de nanomaclado que ocurren en los materiales CCC y CC en función de la temperatura y la orientación de la superficie. Se presenta un estudio mecanístico sobre la influencia de los eventos de nucleación de defectos, que llevan al desarrollo de una compleja red de defectos, sobre la nanodureza y su convergencia hacia un valor relativamente constante a medida que el indentador penetra en la superficie La modelización del comportamiento uniaxial de la zona deformada debajo de las nanoindentaciones permite la correlación entre ambos tipos de ensayos. Los resultados de esta comparación ilustran el importante papel que juegan los procesos de nucleación de dislocaciones sobre la formación de nanohuellas plásticas, lo que difiere (en términos mecanísticos) del comportamiento plástico convencional encontrado en escales micro y macroscópicas, donde el carácter evolutivo de una red de defectos preexistente gobierna la formación de huella, cumpliéndose así que cuanto mayor es la densidad de defectos, mayores son también las macro y microdurezas. En general, este trabajo aporta un trasfondo fundamental para comprender la razón por la que las superficies CC son más duras que las CCC en la nano escala. En la última parte de esta investigación se utilizan modelos de física estadística para investigar la influencia de los mecanismos de propagación de dislocaciones sobre la emisión de avalanchas plásticas. El análisis se basa en la noción de que la distribución del tamaño de las avalanchas sigue una ley potencial universal. Para investigar esta distribución en cristales cúbicos, se realizan un grupo de simulaciones novedosas donde las celdas computaciones, que contienen arreglos periódicos de las redes de dislocaciones, son sometidas a cargas uniaxiales a diferentes temperaturas y velocidades de deformación. A velocidades de deformación suficientemente lentas, las redes de dislocaciones evolucionan a través de la emisión de avalanchas que no se sobreponen en el tiempo, lo que ilustra que la movilización de las redes ocurre de tal manera que se garantiza una alternancia entre periodos de inactividad y cada evento plástico. La comparación entre resultados experimentales y computacionales lleva a encontrar la existencia de una magnitud de deslizamiento crítico que separa a dos regímenes de avalanchas cuya distribución de tamaños obedece leyes potenciales. Este resultado demuestra que los procesos de avalanchas son claramente dependientes de los mecanismos de deslizamiento e interacción de dislocaciones presentes en el material; aspecto que describe la transición entre el modelo de criticalidad gobernada por la tensión y el de criticalidad auto-organizada. Las simulaciones muestran los mecanismos específicos que caracterizan la emisión y propagación de avalanchas en metales CC y CCC en un amplio rango de temperatura, lo que es de gran importancia para justificar la utilización de estos modelos de criticalidad.
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Lin, Peter Keng-Yu. "Evolution of grain boundary character distributions in FCC and BCC materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27994.pdf.

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Sinclair, Chad. "Co-deformation of a two-phase FCC/BCC material /." *McMaster only, 2001.

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Douat, Benjamin. "Étude de surfaces sous contrainte à l'échelle atomique : application au cas du niobium." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2274/document.

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Les mécanismes de déformation plastique des matériaux cubiques à corps centré sont étudiés depuis plus d’un demi-siècle. Il est maintenant bien établi que les dislocations vis contrôlent la plasticité de ces matériaux. Ceci est dû à une structure non-plane du cœur de ces dislocations, qui induit une forte friction de réseau communément appelée ‘pseudo-Peierls’. Le mécanisme supposé est la nucléation thermiquement activée de paires de décrochements. Cette structure de cœur particulière limite également les plans de glissement possibles. Les traces de glissement aux échelles méso et microscopiques apparaissent ‘ondulées’, ce qui a amené à proposer toute une variété de plans de glissement.Dans ce contexte, nous avons analysé à une échelle plus fine, i .e. à l’échelle atomique, les traces de glissement obtenues par déformation en compression de monocristaux de niobium à des températures situées dans le régime de température thermiquement activé: 293 K, 200 K et 90 K. L’analyse par microscopie à effet tunnel sous environnement ultra vide indique qu’à la résolution atomique chaque trace de glissement peut être décomposée en segments associés à des plans de type {112} et {110}. De manière surprenante, il est mis en évidence qu’à 293 K et 200 K du glissement se produit à la fois dans le sens maclage et antimaclage. De plus, toutes les traces de glissement impliquent du glissement sur des plans de type {110}, étayant ainsi la structure de cœur compact prévue par simulations atomistiques ab initio.L’étude in situ de la surface sous contrainte, à T = 293 K et 200 K, a aussi mis en évidence des réorganisations, voire des disparitions, de terrasses atomiques au voisinage de dislocations émergentes. Le calcul des forces d’interaction en élasticité linéaire isotrope montre que les dislocations proches de ces terrasses ne jouent pas de rôle prépondérant sur la position d’équilibre des terrasses. En revanche, celles-ci modifient localement le potentiel chimique de surface, favorisant la diffusion atomique à l’origine des réorganisations de surface constatées expérimentalement<br>The plastic deformation of body-centred cubic metals is the subject of extensive studies since more than half a century. It is now well established that the screw dislocations control the plasticity of these metallic metals. The reason for this is attributed to a non-planar configuration of the core of these dislocations, which induces a high friction force usually referred to as ‘pseudo-Peierls’. The underlying elementary mechanism is the thermally activated nucleation of kink pairs. While perfect screw dislocations do not have specific glide plane, the non-planar core configuration limits the number of possible slip planes. The slip traces observed at the meso and microscopic scales are wavy, which has leaded to the proposal of several possible slip planes.In this context, we propose an analysis at a finer scale, i.e. the atomic scale, of the slip traces produced by compressive stress on niobium single crystals at three temperatures in the thermally activated temperature regime, namely: 293 K, 200 K and 90 K. The analyses were carried out using a scanning tunnelling microscope under ultra-high vacuum environment. At this scale of observation, the slip traces are made up of crystallographic segments that can be associated with {011} and {112} planes. It is also noticeable that at 200 K and 293 K dislocation glide is observed in both the twinning and the anti-twinning directions. More importantly, all slip traces include segments that belong to {011} planes strongly supporting the latest ab initio atomistic simulations predicting a compact core configuration for screw dislocation.In this study, we also established that, at T = 293 K and 200 K, the sample surface may undergo drastic changes of its vicinal terraces, when they are close to emerging dislocations. The calculation of interaction forces, in the frame of isotropic linear elasticity, indicates that dislocations close to vicinal terraces do not play a major role regarding the stable positions of the vicinal terraces. However, they locally modify the chemical potential of the surface, thus enhancing atomic diffusion which is at the origin of the surface reorganisations experimentally observed
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Books on the topic "Plasticity of bcc materials"

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Altenbach, Holm, and Andreas Öchsner, eds. Plasticity of Pressure-Sensitive Materials. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40945-5.

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Kang, Guozheng, and Qianhua Kan. Cyclic Plasticity of Engineering Materials. John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119180838.

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Borja, Ronaldo I. Plasticity: Modeling & Computation. Springer Berlin Heidelberg, 2013.

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Plasticity of metals & alloys. Nova Science Publishers, 2008.

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Lin, Peter Keng-Yu. Evolution of grain boundary character distributions in FCC and BCC materials. National Library of Canada = Bibliothèque nationale du Canada, 1997.

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Altenbach, Holm, Michael Brünig, and Zbigniew L. Kowalewski, eds. Plasticity, Damage and Fracture in Advanced Materials. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34851-9.

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Chen, W. F. Constitutive equations for engineering materials. 2nd ed. Elsevier, 1994.

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Chen, W. F. Constitutive equations for engineering materials. Elsevier, 1994.

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Skrzypek, Jacek. Plasticity and creep: Theory, examples, and problems. Edited by Hetnarski Richard B. Begell House, 1993.

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Bertram, A. Elasticity and Plasticity of Large Deformations: An Introduction. 2nd ed. Springer-Verlag Berlin Heidelberg, 2008.

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Book chapters on the topic "Plasticity of bcc materials"

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Ecke, Martin, Oliver Michael, Markus Wilke, Sebastian Hütter, Manja Krüger, and Thorsten Halle. "Deformation Twinning in bcc Iron - Experimental Investigation of Twin Formation Assisted by Molecular Dynamics Simulation." In Plasticity, Damage and Fracture in Advanced Materials. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34851-9_4.

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Li, He Jie, Jing Tao Han, Zheng Yi Jiang, Hua Chun Pi, Dong Bin Wei, and Anh Kiet Tieu. "Crystal Plasticity Finite Element Modelling of BCC Deformation Texture in Cold Rolling." In Frontiers in Materials Science and Technology. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-475-8.251.

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Lim, Hojun, Corbett C. Battaile, and Christopher R. Weinberger. "Simulating Dislocation Plasticity in BCC Metals by Integrating Fundamental Concepts with Macroscale Models." In Integrated Computational Materials Engineering (ICME) for Metals. John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119018377.ch4.

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Raabe, Dierk, Franz Roters, and Yan Wen Wang. "Simulation of Earing during Deep Drawing of bcc Steel by Use of a Texture Component Crystal Plasticity Finite Element Method." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-975-x.1529.

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Suzuki, Taira, Shin Takeuchi, and Hideo Yoshinaga. "Dislocations in bcc Metals and Their Motion." In Dislocation Dynamics and Plasticity. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75774-7_6.

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Carter, C. Barry, and M. Grant Norton. "Plasticity." In Ceramic Materials. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3523-5_17.

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Harrison, Ralph J., Arthur F. Voter, and Shao-Ping Chen. "Embedded Atom Potential for BCC Iron." In Atomistic Simulation of Materials. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5703-2_23.

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Herzig, Chr. "Diffusion and Soft Phonons in BCC Metals." In Diffusion in Materials. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1976-1_11.

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Duggan, B. J., G. J. Shen, and Yong Bo Xu. "Deformation and Recrystallisation of bcc Mg Li." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-975-x.699.

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Ostapovets, A., and Václav Paidar. "Planar Defects on (112) in BCC Crystals." In Materials Science Forum. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-469-3.69.

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Conference papers on the topic "Plasticity of bcc materials"

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Korchuganov, Aleksandr V., Konstantin P. Zolnikov, and Dmitrij S. Kryzhevich. "Influence of free surface orientation on plasticity nucleation in BCC metals." In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083376.

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Zhang, Shaorui, Yinghong Peng, Dayong Li, and Lijuan Hu. "Analysis of BCC Sheet Metal Forming by Polycrystalline Plasticity method." In MATERIALS PROCESSING AND DESIGN; Modeling, Simulation and Applications; NUMIFORM '07; Proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes. AIP, 2007. http://dx.doi.org/10.1063/1.2740900.

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"INFLUENCE OF GRAIN STRUCTURE ON THE MECHANISMS OF PLASTICITY NUCLEATION IN BCC METAL UNDER MECHANICAL LOADING." In Fizicheskaya mezomekhanika. Materialy s mnogourovnevoy ierarkhicheski organizovannoy strukturoy i intellektual'nye proizvodstvennye tekhnologii. Tomsk State University, 2020. http://dx.doi.org/10.17223/9785946219242/102.

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Voothaluru, Rohit, Vikram Bedekar, and Praveen Pauskar. "A New Micromechanical Model to Study Transformation Plasticity in High-Carbon Steels." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-3043.

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Abstract Hardened steels in engineering applications tend to have gradient microstructures with varying amounts of retained austenite alongside harder phases such as martensite or bainite. However, the metastable austenite can transform into martensite under mechanical loads, resulting in an inelastic strain within the material from the volumetric mismatch between FCC austenite and BCT martensite. In this work, a new constitutive formulation based upon the critical driving force for austenite transformation is presented. The model was implemented into a crystal plasticity formulation, and empirical data from in-situ neutron diffraction was used to determine the local micro-plasticity and transformation plasticity parameters. The results from finite element modeling also show that using a homogenized finite element approach could help to establish a material model that can capture the transformation plasticity within these materials with good accuracy.
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Hammi, Youssef, Mark F. Horstemeyer, and Doug J. Bammann. "Modeling of Anisotropic Damage for Ductile Materials in Metal Forming Processes." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32999.

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The primary goal of this study is to model the anisotropic effect of ductile damage in metal forming processes. To represent the ductile metals, an anisotropic ductile plasticity/damage formulation is considered within the framework of continuum mechanics. The formulation is motivated from fracture mechanisms and physical observations in Al-Si-Mg aluminum alloys with second phases. The ductile damage mechanisms are represented by the classical ductile process of nucleation of voids at inclusions, followed by their growth and coalescence. Functions of each mechanism evolution are related to different microstructural parameters. The damage, represented by a second rank tensor, is coupled to the Bammann-Chiesa-Johnson (BCJ) rate-dependent plasticity using the effective stress concept. The constitutive equations are integrated using a fully implicit scheme and implemented into a explicit finite element code. This implementation is used to predict damage during the forward axisymmetric extrusion of an aluminum bar. This example illustrates the applicability of the model to predict the initiation and the evolution of anisotropic damage in metal forming processes.
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Ibrahim, Youssef, Khaled H. Khafagy, Tarek M. Hatem, and Hesham A. Hegazi. "Three-Dimensional Crystal Plasticity Modelling of High-Strength Tool Steels Using Fourier Based Spectral Solver." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24167.

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Abstract Tool steels are essential for any industry, being used to cut, drill, form, shear, and shape ferrous and non-ferrous materials in bulk or powder forms. Due to the harsh service environment, tool steels are engineered with superior properties that include high wear, corrosion, and impact resistance. The macro properties of tool steel alloys are acknowledged to depend upon their fine martensitic microstructure. Therefore, accurate representation of its microstructures will help to further study its behavior which shall lead in advancing and improving their properties. In the current research, a novel microstructure generator for tool steel alloys will be used to precisely simulate complex microstructures of tool steels. The novel generating algorithm along with multiple-slip crystal plasticity based model and specialize spectral solver formulations are used to investigate high-speed tools steels behavior. The spectral method for elastoviscoplastic boundary value problems implicitly uses fast Fourier transformation algorithm (FFT) by applying periodic BCs. Both quasi-static and dynamic uniaxial tensile loading in the [010] direction is applied on a RVE of AISI H11 martensitic tool steel. Validating the numerical results with the experimental results of tool steels is presented.
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Wen, Q., Y. B. Guo, and K. A. Woodbury. "Adiabatic Shear Modeling and Its Influence on Machining Simulations: BCJ vs. JC Model." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80107.

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The understanding of mechanical behavior in machining is critical to analyze and design a process. It is well known that work materials experience large strains, high strain rates, high temperatures, and complex loading histories. Adiabatic or quasi-adiabatic condition is an important feature of material deformations in machining ferrous alloys. The problem of how to accurately model the mechanical behavior including the adiabatic effect is essential to understand a machining process. Several constitutive equations such as the simple power law model, Johnson-Cook (JC) model, and other models have often been used to approximate flow stress in machining analysis and simulations. The JC and other empirical or semi-empirical models lack mechanisms in incorporating complex loading effects. The internal state variable plasticity Baumann-Chiesa-Johnson model (BCJ model) has been shown to incorporate loading histories as well as state variables. In this study, we have determined the material constants of AISI 52100 steel (62 HRc) for both the JC and BCJ models using the same baseline stress-strain data. The material constants were obtained by fitting the JC and BCJ models to these test data at different strains, strain rates, and temperatures using nonlinear least square methods. Both models are capable of modeling strain hardening and thermal softening phenomena. However, the BCJ model can also accommodate the adiabatic effect, while the JC model is basically isothermal. Orthogonal cutting tests and FEA simulations, based on the design-of-experiment method, were performed using the cutting tool with a 20° chamfer angle. The predicted saw-tooth chip morphology and dimensions using the BCJ model are consistent with the measured chips in the cutting tests, while the JC model yielded discontinuous chips. In addition, the BCJ model gave larger subsurface von Mises stress, plastic strain, and temperature compared with those by the JC model.
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Rudd, Robert E., L. H. Yang, P. D. Powell, et al. "Modeling laser-driven high-rate plasticity in BCC lead." In SHOCK COMPRESSION OF CONDENSED MATTER - 2017: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. Author(s), 2018. http://dx.doi.org/10.1063/1.5044836.

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Greer, Julia R., Ju-Young Kim, and Steffen Brinckmann. "In-Situ Investigation of Plasticity at Nano-Scale." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59117.

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Mechanical behavior of crystals is dictated by dislocation motion in response to applied force. While it is extremely difficult to directly observe the motion of individual dislocations, several correlations can be made between the microscopic stress-strain behavior and dislocation activity. Here, we present for the first time the differences observed between mechanical behavior in two fundamental types of crystals: face-centered cubic, fcc (Au, Cu, Al, Ni, etc.) and body-centered cubic, bcc (W, Cr, Mo, Nb, etc.) with sub-micron dimensions subjected to in-situ micro-compression in SEM chamber. In a striking deviation from classical mechanics, there is a significant increase in strength as crystal size is reduced to 100nm; however in gold crystals (fcc) the highest strength achieved represents 44% of its theoretical strength while in molybdenum crystals (bcc) it is only 7%. Moreover, unlike in bulk where plasticity commences in a smooth fashion, both nano-crystals exhibit numerous discrete strain bursts during plastic deformation. These remarkable differences in mechanical response of fcc and bcc crystals to uniaxial micro-compression challenge the applicability of conventional strain-hardening to nano-scale crystals. We postulate that they arise from significant differences in dislocation behavior between fcc and bcc crystals at nanoscale and serve as the fundamental reason for the observed differences in their plastic deformation. Namely, dislocation starvation is the predominant mechanism of plasticity in nano-scale fcc crystals while junction formation and subsequent hardening characterize bcc plasticity, as confirmed by the microstructural electron microscopy. Experimentally obtained stress-strain curves together with video frames during deformation and cross-sectional TEM analysis are presented, and a statistical analysis of avalanche-like strain bursts is performed for both crystals and compared with stochastic models.
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Germann, Timothy C., Mark Elert, Michael D. Furnish, William W. Anderson, William G. Proud, and William T. Butler. "LARGE-SCALE CLASSICAL MOLECULAR DYNAMICS SIMULATIONS OF SHOCK-INDUCED PLASTICITY IN BCC NIOBIUM." In SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2009. http://dx.doi.org/10.1063/1.3295252.

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Reports on the topic "Plasticity of bcc materials"

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Grinfeld, Michael, Scott E. Schoenfeld, and Tim W. Wright. Toward Modeling Limited Plasticity in Ceramic Materials. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada486919.

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Bonner, B., M. Leblanc, D. Lassila, D. Field, and J. Escobedo. Measurement of Shear Strength in BCC Materials Subjected to Moderate Pressures. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/15013904.

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Gerberich, W. W. [A microstructural approach to fatigue crack processes in poly crystalline BCC materials]. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/6345356.

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Gerberich, W. W. [A microstructural approach to fatigue crack processes in poly crystalline BCC materials]. Progress report. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10164544.

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Deo, Chaitanya, Ting Zhu, and David McDowell. Fundamental Understanding of Ambient and High-Temperature Plasticity Phenomena in Structural Materials in Advanced Reactors. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1107616.

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Chen, Z., and H. L. Schreyer. Formulation and computational aspects of plasticity and damage models with application to quasi-brittle materials. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/120890.

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Michael V. Glazoff and Jeong-Whan Yoon. DEVELOPMENT OF PLASTICITY MODEL USING NON ASSOCIATED FLOW RULE FOR HCP MATERIALS INCLUDING ZIRCONIUM FOR NUCLEAR APPLICATIONS. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1111011.

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