繰り返し荷重を受ける銅ナノワイヤの塑性変形に関する分子動力学法解析：結晶方位の影響

抄録

In this study, we carried out molecular dynamics simulations of fatigue of single-crystal copper nanowires for the purpose of revealing the fatigue mechanisms of metal nanowires. We examined four nanowire models with different crystal orientations to investigate the effect of the single- and multi-slip deformation. Cyclic tension and compression were applied to the nanowire models. As a result, we observed that atomic vacancies were formed by dislocation motion during cyclic deformation. We found two types of the vacancy formation mechanisms, i.e., motion of a jogged screw dislocation and intersection of two stacking faults in different slip systems, which are the possible causes of fatigue in nanomaterials.