论文标题
滑翔螺钉错位上扭结的统计力学
Statistical mechanics of kinks on a gliding screw dislocation
论文作者
论文摘要
以人体为中心金属变形塑性的能力受螺钉位错的热激活滑动运动的限制，螺钉位错的是线缺陷，其迁移率表现出复杂的依赖性，依赖于温度，压力和位错段长度。我们基于统计力学论证来得出脱位滑动速度的分析表达，并确定由临界温度标记的明显相变，高于临界温度，该临界温度的激活能有效地完成了一半，从双重扭结的形成能量变为单个扭结。该分析与直接动力学蒙特卡洛模拟的定量一致。
The ability of a body-centered cubic metal to deform plastically is limited by the thermally activated glide motion of screw dislocations, which are line defects with a mobility exhibiting complex dependence on temperature, stress, and dislocation segment length. We derive an analytical expression for the velocity of dislocation glide, based on a statistical mechanics argument, and identify an apparent phase transition marked by a critical temperature above which the activation energy for glide effectively halves, changing from the formation energy of a double kink to that of a single kink. The analysis is in quantitative agreement with direct kinetic Monte Carlo simulations.
