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单晶γ-TiAl合金纳米切削过程的分子动力学模拟
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兰州理工大学

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TH161

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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)


Molecular dynamics simulations of nanometric cutting process of single crystal γ - TiAl alloy
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LanZhou University Of Technology

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    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。

    Abstract:

    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.

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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.]
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历史
  • 收稿日期:2017-11-08
  • 最后修改日期:2018-04-12
  • 录用日期:2018-04-26
  • 在线发布日期: 2019-06-04
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