摘要
采用多尺度准连续介质法分别模拟六种不同压头宽度下,铝薄膜纳米压痕初始塑性变形过程。在弹性变形阶段,矩形压头的宽度越大,对应载荷-位移曲线的斜率越大,此时铝薄膜加载越困难。随着矩形压头宽度的不断增加,铝薄膜发生塑性变形所需的临界载荷越大,铝薄膜的纳米硬度呈现不断减小的趋势,铝薄膜呈现出明显的尺寸效应。铝薄膜中位错在压头两端正下方远离表面的地方形核,形成的全位错会迅速分解为两个Shockley分位错,压头宽度越大,分位错之间的距离越大。
The multi-scale quasi-continuum method was used to simulate the initial plastic deformation process of nanoindentation of aluminum film under six different indenter widths. In the elastic deformation stage,the width of the rectangular indenter is larger. The larger the slope corresponding to the load displacement curve,the loading of aluminum film is more difficult. With the increase of the width of the rectangular indenter,the critical load required for plastic deformation of the aluminum film increases,and the nano-hardness of the aluminum film decreases. The size effect of the aluminum film is obvious. The dislocations in the aluminum film are located at the local core which is far away from the surface at the bottom of the indenter. The dislocations are rapidly decomposed into two Shockley dislocations. The larger the indenter width,the greater the distance between the dislocations.
作者
陶冶
王梓杰
丁春园
TAO Ye;WANG Zijie;DING Chunyuan(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《现代信息科技》
2018年第10期1-5,8,共6页
Modern Information Technology
关键词
准连续介质法
纳米压痕
尺寸效应
quasi-continuum method
nanoindentation
size effect
