マグネシウムのpop-in挙動に及ぼす結晶方位の影響

抄録

The impact of crystal orientation on incipient plasticity (in particular, pop-in behavior) was investigated via both experimental and numerical methods. The results obtained from nano-indentation testing reveal that the incipient plasticity is influenced by its orientation. The pop-in load and pop-in width for indentation to basal plane are higher and larger as compared with those for indentation to prismatic plane. From deformed microstructural observations, dislocations having <c> components are activated in the sample which indented to basal plane; however, such dislocation traces are unlikely to be confirmed in the case of indentation to prismatic plane. Numerical results through molecular static simulations provide a first activation of basal <a> dislocations and then occurrence for pyramidal dislocation activities.