标题： 室温下滑移力作用下面心立方镍中台阶处的空位发射 显示英文标题

标题： Room-temperature vacancy emission from the jog on edge dislocation in FCC nickel under glide force

摘要： 滑移，位错上的原子尺度台阶，在晶体塑性中起着重要作用，但在离散位错动力学（DDD）模拟中由于其尺寸小常常被忽略。 虽然螺位错上的滑移已知会非保守地移动（即攀移），伴随着空位的发射，但通常认为刃位错上的滑移在环境条件下会保守地移动（即滑移）并与位错一起移动。 在这里，我们报告了在300K时含有一个单位滑移对的面心立方镍刃位错的分子动力学模拟中的意外发现。 虽然在低应力下滑移与刃位错保守地滑移，但我们观察到在较高应力下其中一个滑移会间歇性地攀移并发射空位。 这一观察结果在如此低温下是出人意料的，因为攀移通常与更接近蠕变温度（约为熔点的一半）的温度相关。 我们的结果突显了点缺陷（即空位）与位错在室温塑性中的复杂相互作用的重要性，表明这些相互作用可能比之前认为的更为重要。 显示英文摘要

摘要： Jogs, atomic-scale steps on dislocations, play an important role in crystal plasticity, yet they are often ignored in discrete dislocation dynamics (DDD) simulations due to their small sizes. While jogs on screw dislocations are known to move non-conservatively (i.e. climb) accompanied by vacancy emission, jogs on edge dislocations are commonly expected to move conservatively (i.e. glide) with the dislocation under ambient conditions. Here we report unexpected findings from molecular dynamics simulations of an edge dislocation containing a pair of unit jogs in face-centered cubic nickel at 300K. While the jogs glide conservatively with the edge dislocation at low stresses, we observe that one of the jogs climbs and emits vacancies intermittently at higher stresses. This observation is unexpected at such a low temperature, as climb is typically associated with temperatures closer to the creep temperature (roughly half of the melting temperature). Our results highlight the significance of the complex interplay between point defects (i.e., vacancies) and dislocations in room-temperature plasticity, suggesting that these interactions may be more significant than previously thought.