北京科技大学学报2012，Vol.34Issue(8)：898-902,5.
基于分子动力学的纳米压痕形变过程模拟
Molecular dynamics simulation of plastic deformation during nanoindentation
摘要
Abstract
Molecular dynamics simulation was performed to study the nanoindentation process of a hard diamond tip into an Fe substrate. The atomic configuration of the substrate, the load-displacement curve, and the emission and variation of dislocations during loading and unloading processes were investigated. The plastic deformation mechanism of the substrate was discussed. It is found that during the loading process, the dislocation occurs when the indentation depth is about 0.69 nm ; with the indentation depth increasing, the dislocation grows up into a dislocation loop and the plastic deformation of the substrate becomes more severe. During the unloading process, with the decrease of indentation depth, the number of dislocation loops decreases continuously; when the indenter returns to its starting position, there are still a small amount of dislocation loops in the center of the substrate, and this is the main reason for the permanent plastic deformation of the substrate.关键词
纳米压痕/分子动力学/位错运动/塑性形变Key words
nanoindentation/molecular dynamics/dislocation motion/plastic deformation分类
金属材料引用本文复制引用
吕国才,宿彦京,褚武扬,乔利杰..基于分子动力学的纳米压痕形变过程模拟[J].北京科技大学学报,2012,34(8):898-902,5.基金项目
国家重点基础研究发展计划资助项目 （）
