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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(英文),2019,48(5):1559~1566.[fengruicheng and 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.]
Molecular dynamics simulations of nanometric cutting process of single crystal γ - TiAl alloy
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Received:November 08, 2017  Revised:April 12, 2018
DOI:
Key words: single crystal γ-TiAl alloy  nanometric cutting  molecular dynamics  dislocation
Foundation item: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)
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fengruicheng and qiaohaiyang  
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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.