压头速度对Ni3Al纳米压痕过程影响的数值仿真

用分子动力学仿真分析金刚石压头速度（5~30 m/s）对Ni3Al纳米压痕分子动力学结果的影响.采用中心对称参数（Center Symmetry Parameter，CSP）分析相同压入深度时各模型基体内部位错的萌生和生长情况.结果表明压头压入速度对纳米压痕过程有显著影响：压头压入速度越大，最大加载力和相应的硬度也越大；压入速度对基体内部位错萌生和生长的发生时间有显著影响，但其对位错运动的总体趋势不能产生明显影响.

Numerical simulation on effect of indenter velocity on Ni3Al nano indentation process

The effect of the diamond indenter velocity (5~30 m/s) on the result of Ni3Al nano indentation molecular dynamics is analyzed by molecular dynamics simulation and analysis. The Center Symmetry Parameter(CSP) is used to analyze the dislocation initiation and growth of different models under the same indentation depth. The results show that the indenter velocity has significant effect on the nano indentation process. The faster the indenter velocity is, the larger the maximum indention load and the corresponding hardness are, and the indenter velocity has significant effect on the time of the dislocation initiation but it can not affect the overall tendency of dislocation motion.