Tension-compression asymmetry of grain-boundary sliding: A molecular dynamics study
XT Li and AG Sheinerman and ZY Zhu and F Zhao, MATERIALS LETTERS, 325, 132822 (2022).
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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