CAJ | 학술논문

为了研究压头晶体各向异性对纳米压痕变形机理的影响，用多尺度准连续介质(QC)法模拟了不同晶向的 Ni 压头与 Ag 薄膜的纳米压痕过程，对比不同晶向的压头在薄膜的弹-塑性转变点和最大载荷时薄膜中的原子滑移带，发现压头的晶向是决定薄膜开启原子滑移系的难易的关键因素。研究了压头在不同晶向下纳米压痕过程中 Ag 薄膜的变形机理，发现薄膜中原子滑移大都由压头拐角处触发。用 Rice-Thomson 位错模型计算得到压头表面正应力和切应力的分布图，借助应力分布图讨论了薄膜原子滑移的开启机理。
위료연구압두정체각향이성대납미압흔변형궤리적영향，용다척도준련속개질(QC)법모의료불동정향적 Ni 압두여 Ag 박막적납미압흔과정，대비불동정향적압두재박막적탄-소성전변점화최대재하시박막중적원자활이대，발현압두적정향시결정박막개계원자활이계적난역적관건인소。연구료압두재불동정향하납미압흔과정중 Ag 박막적변형궤리，발현박막중원자활이대도유압두괴각처촉발。용 Rice-Thomson 위착모형계산득도압두표면정응력화절응력적분포도，차조응력분포도토론료박막원자활이적개계궤리。
Quasicontinuum method was applied to investigate the deformational mechanism of single crystal Ag thin film with Ni indenter in different crystal direction.The influences of anisotropic behavior of Ni indenter on the load necessary for first dislocation emission and contact stress distribution were studied in the nanoindenta-tion deformation process.Results show that the sharp of the load-displacement curves are due to the collective dislocation activities.The indenter with different crystal direction can greatly influence the load necessary for first dislocation emission and contact stress distribution.The simulation results are also compared and analyzed with the Rice-Thomson dislocation model.