Plastic Deformation by Grain Boundary Motion: Experiments and Simulations
Plastic Deformation by Grain Boundary Motion: Experiments and Simulations
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DOI：
10.1002/9783527652815.ch09
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发表时间：
2013-07
期刊：
影响因子：
--
通讯作者：
D. Molodov;Y. Mishin
中科院分区：
文献类型：
--
作者：
D. Molodov;Y. Mishin
本章概述了应力驱动的晶界（GB）运动与剪切变形、聚焦及其在多晶材料塑性变形中的作用。我们回顾了现象学，耦合GB运动，以及在其研究中采用的模拟和实验方法。讨论了该领域的研究现状和最活跃的研究方向，包括耦合的几何理论、耦合模的多重性及其与晶体对称性的关系、耦合晶界迁移的动力学及其原子机制、非对称和更一般类型晶界的耦合运动以及耦合效应与晶粒旋转之间的联系。在整个讨论中，我们强调了实验，理论和模拟之间的相互作用，使最近的进展，在理解这一重要现象的关键作用。最后，我们概述了尚未解决的问题和预期的未来发展在这一领域。
This chapter presents an overview of stress‐driven grain boundary (GB) motion coupled to shear deformation, focusing, and its role in plastic deformation of polycrystalline materials. We review the phenomenology, the coupled GB motion, and the simulation and experimental methodologies employed in its studies. The current status and the most active research directions in this field are discussed, including the geometric theory of coupling, the multiplicity of coupling modes and its relation to crystal symmetry, the dynamics of coupled GB migration and its atomic mechanisms, the coupled motion of asymmetric and more general types of GBs, and the connection between the coupling effect and grain rotation. Throughout this discussion, we highlight the critical role of the interaction between experiments, theory, and simulations that enabled the recent progress in understanding this important phenomenon. We conclude by outlining the unresolved problems and anticipated future developments in this field.