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Dislocation Damping and Defect Friction Damping in Magnesium: Molecular Dynamics Study
Metals and Materials International ( IF 3.5 ) Pub Date : 2019-12-21 , DOI: 10.1007/s12540-019-00566-y
Jingyu Zhai , Xinyuan Song , Anyang Xu , Yugang Chen , Qingkai Han

Abstract

In this study, the molecular dynamics method was used to study the damping mechanism in Mg alloys at the atomic scale. The energy dissipated by the nucleation and motion of dislocations and by defects friction, and the effect of defects, such as vacancies, cracks, and grain boundaries, on them were studied. The study shows that different kinds of defect have different effects on the dislocation damping and defect friction damping. And then, the effect of strain amplitude and temperature on damping capacity of Mg was studied. The result shows that the amplitude independent damping is caused by defect friction and the amplitude dependent damping is mainly caused by the nucleation and motion of dislocation; the damping of Mg increased exponentially with the temperature, and the damping peck appeared at 440 K is attributed to the appearance of dislocations at the grain boundaries which may be caused by boundaries self-diffusion.

Graphic Abstract



中文翻译:

镁中的位错阻尼和缺陷摩擦阻尼:分子动力学研究

抽象的

在这项研究中,分子动力学方法被用来研究镁合金在原子尺度上的阻尼机理。研究了由位错的形核和运动以及缺陷摩擦所耗散的能量,以及诸如空位,裂纹和晶界等缺陷对它们的影响。研究表明,不同种类的缺陷对位错阻尼和缺陷摩擦阻尼的影响不同。然后研究了应变幅值和温度对镁的阻尼能力的影响。结果表明,与振幅无关的阻尼是由缺陷摩擦引起的,与振幅有关的阻尼主要是由位错的形核和运动引起的。Mg的阻尼随温度呈指数增长,

图形摘要

更新日期:2019-12-21
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