材料科学
不对称
压缩(物理)
张力(地质)
剪切(地质)
晶界
分子动力学
复合材料
压力(语言学)
剪应力
晶界滑移
弯曲
微观结构
物理
量子力学
语言学
哲学
作者
Xiao-Tao Li,A. G. Sheĭnerman,Zhenyu Zhu,Feng Zhao
标识
DOI:10.1016/j.matlet.2022.132822
摘要
The underlying mechanisms of the tension–compression asymmetry of grain boundary (GB) sliding are studied by molecular dynamics (MD) simulations. The results show that the compressive stress has a suppression effect on GB sliding, while the tensile stress has a promotion effect. The pressure-dependent behaviors of GB sliding are attributed to two aspects. The first one is the tension–compression asymmetry of local shear events in GBs, which is similar to shear banding in metallic glasses. The other is due to a novel strengthening mechanism of compression-induced GB bending, which increases the plastic flow stress.
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