Contrasting thermal behaviors in Σ3 grain boundary motion in nickel

Contrasting thermal behaviors in Σ3 grain boundary motion in nickel
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镍中 Σ3 晶界运动的热行为对比

DOI:
10.1016/j.actamat.2019.06.003
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发表时间:
2019
期刊:
影响因子:
9.4
通讯作者:
Holm, Elizabeth A.
Holm, Elizabeth A.
中科院分区:
材料科学1区
文献类型:
--
作者:
Humberson, Jonathan;Chesser, Ian;Holm, Elizabeth A.

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利用合成驱动力分子动力学模拟来调查三类非相干Σ3孪晶界的晶界迁移率:<112>、<110>和<111>倾斜晶界。这些边界在低能平面上形成小面,并且通过构成移动小面的部分位错三联体的滑动来发生阶跃流边界运动。识别并表征随倾角变化的系统趋势。热激活、反热和非热运动的观察可以根据肖克利部分位错沿密排和非密排方向的方向来解释。发现具有{110}孪晶面的热激活<112>倾斜边界比具有{112}孪晶面的<110>倾斜边界具有更小的运动能垒。热激活边界遵循与小面粗糙化过渡相关的补偿效应。对于所有分面边界,必须谨慎选择系统尺寸和驱动力,以防止出现模拟伪影。
Synthetic driving force molecular dynamics simulations were utilized to survey grain boundary mobility in three classes of incoherent Σ3 twin boundaries: <112>, <110>, and <111> tilt boundaries. These boundaries are faceted on low energy planes, and step flow boundary motion occurs by glide of the triplets of partial dislocations that comprise the mobile facets. Systematic trends with inclination angle are identified and characterized. Observations of thermally activated, anti-thermal, and athermal motion are explained in terms of the orientation of the Shockley partial dislocations along close-packed and non-close-packed directions. Thermally activated <112> tilt boundaries with {110} twin facets are found to have smaller energy barriers to motion than <110> tilt boundaries with {112} twin facets. Thermally activated boundaries follow a compensation effect associated with a facet roughening transition. As for all faceting boundaries, system size and driving force must be chosen with care to prevent simulation artifacts.
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