Fe_3Al表面划痕形变与切屑形成的分子动力学研究  

Molecular Dynamics Simulation of Surface Deformation and Piles Generation in Scratching on Fe_3Al

作　　者：彭俊[1] 马艳[1] 郭慧君 China PengJun1 , MaYan1 , GuoHuijun2(1. School of Physics Science and Engineering, Tongji University, Shanghai 200092, 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, Chin)

机构地区：[1]同济大学物理科学与工程学院,上海200092 [2]中国科学院上海硅酸盐研究所,上海201800

出　　处：《机械科学与技术》2018年第5期704-708,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(61565004;91123022);广西高校光电信息处理重点实验室开放基金项目(KFJJ2014-01)资助

摘　　要：采用分子动力学方法研究AFM探针在铁铝合金表面划痕的形变特性。仔细分析了切屑的形成过程以及对沟槽形貌的影响。结果发现切屑的形成分为增长期和稳定期两个阶段,增长期切屑高度不断增加,稳定期切屑高度趋于稳定。探针后方出现粘连,随着探针的移动而分裂为两部分。另外,考察了划痕深度与划痕速度对切屑形成的影响。发现切屑高度随划痕深度的增加而增加,划痕速度的增加则不改变基底的形变特性,但会促使稳定期的提前到来。A series of molecular dynamics simulations has been performed to study the surface deformation behavior and piles generation process of Fe_3Al scratched by an atomic force microscopy probe. A scratching test is carried out to examine the generation of piles and its effects on surface appearance of a groove. Simulation results show that the generation of piles is a two-stage process. At the growing stage,the height of piles increases continuously. At the stable stage,the height of piles rarely changes. Some atoms gradually depart into two pieces with the movement of tip,which adhere to tip at the back. Additional scratching tests are carried out to examine the effects of scratch depth and scratch velocity on the generation of piles. The test results show that the height of piles increase with the increase of scratch depth,while the scratch velocity do not change the deformation behavior of substrate. The greater scratch velocity,however,can advance the entering of the stable stage.

关 键 词：分子动力学 铁铝合金 划痕 表面形变 切屑形成 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]