Exploring the relation between transonic dislocation glide and stacking fault width in FCC metals

Kathryn R. Jones, Khanh Dang, Daniel N. Blaschke, Saryu J. Fensin, Abigail Hunter
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Abstract

Theory predicts limiting gliding velocities that dislocations cannot overcome. Computational and recent experiments have shown that these limiting velocities are soft barriers and dislocations can reach transonic speeds in high rate plastic deformation scenarios. In this paper we systematically examine the mobility of edge and screw dislocations in several face centered cubic (FCC) metals (Al, Au, Pt, and Ni) in the extreme large-applied-stress regime using MD simulations. Our results show that edge dislocations are more likely to move at transonic velocities due to their high mobility and lower limiting velocity than screw dislocations. Importantly, among the considered FCC metals, the dislocation core structure determines the dislocation's ability to reach transonic velocities. This is likely due to the variation in stacking fault width (SFW) due to relativistic effects near the limiting velocities.
探索催化裂化金属中跨音速位错滑行与堆叠断层宽度之间的关系
理论预测了位错无法克服的极限滑动速度。计算和最近的实验表明,这些极限速度是软障碍,在高速塑性变形情况下,位错可以达到跨音速。在本文中,我们利用 MD 模拟系统地研究了几种面心立方(FCC)金属(铝、金、铂和镍)在极端大外加应力条件下边缘位错和螺钉位错的迁移率。我们的结果表明,与螺位错相比,边缘位错具有高迁移率和较低的极限速度,因此更有可能以跨音速运动。重要的是,在所考虑的 FCC 金属中,差排核心结构决定了差排达到跨音速的能力。这可能是由于堆叠断层宽度(SFW)在极限速度附近的相对论效应引起的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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