冯瑞成,乔海洋.单晶γ-TiAl合金纳米切削过程的分子动力学模拟[J].稀有金属材料与工程,2019,48(5):1559~1566.[fengruicheng,qiaohaiyang.Molecular dynamics simulations of nanometric cutting process of single crystal γ - TiAl alloy[J].Rare Metal Materials and Engineering,2019,48(5):1559~1566.]
单晶γ-TiAl合金纳米切削过程的分子动力学模拟
投稿时间:2017-11-08  修订日期:2018-04-12
中文关键词:  单晶γ-TiAl合金  纳米切削  分子动力学  位错  
基金项目:国家自然科学基金项目NO.51665030;长江学者和创新团队发展计划NO.IRT_15R30;兰州理工大学博士基金;甘肃省教育厅研究生导师基金项目(2016A-012)
中文摘要:
      本文采用分子动力学方法研究了单晶γ-TiAl合金纳米切削过程,通过对单晶γ-TiAl合金建模、计算和分析,分析了不同切削深度和速度对切削过程的影响,研究结果发现:在切削过程中,随着切削深度增大,切屑体积逐渐增大,切屑中原子排列越来越紧密,位错密度也会随之增大;随着切削速度增大,位错密度反而会随之降低。在一定的切削深度和速度范围内,切削过程中刀具前方都会产生“V”型位错环,工件温度和势能也都会相应增大。特别是,切削速度为400m/s时,刀具前方的切削表面上未出现原子错排。
Molecular dynamics simulations of nanometric cutting process of single crystal γ - TiAl alloy
英文关键词:single crystal γ-TiAl alloy  nanometric cutting  molecular dynamics  dislocation
英文摘要:
      In this study, molecular dynamics simulations are employed to study the nanometric machining process of single crystal γ - TiAl alloy. The influences of different cutting speeds and depths on nanometric cutting process of single crystal γ - TiAl alloy are?studied by?molecular dynamics modeling, calculation and analysis.?The results show that the accumulated volume of chips increases with the cutting depth increases in nano-cutting process, at the same time the atoms in the chip stack are tighter and the dislocation density is increased; however the dislocation density decreased with the cutting speeds increases. In a certain cutting depth and speeds range, in front of the tool will produce "V"-type dislocation ring of the cutting process, temperature and potential energy of the workpiece will increased correspondingly. In particular, when the cutting speed is 400m/s, there is no atomic misalignment on the cutting surface in front of the tool.
作者单位E-mail
冯瑞成 兰州理工大学 frcly@163.com 
乔海洋 兰州理工大学 244294726@qq.com 
摘要点击次数: 35
全文下载次数: 31
查看全文  查看/发表评论  
关闭