单晶γ-TiAl合金纳米切削过程的分子动力学模拟
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摘要
采用分子动力学方法研究单晶γ-TiAl合金纳米切削过程,通过对单晶γ-TiAl合金的建模、计算和分析,讨论了不同切削深度和切削速度对切削过程的影响,结果发现:在切削过程中,随着切削深度的增大,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;但随着切削速度的增大,位错密度反而会随之降低。在一定的切削深度和切削速度范围内,切削过程中刀具前方都会产生"V"型位错环,工件的温度和势能也都会相应的增大。特别是,当切削速度为400 m/s时,刀具前方的切削表面上未出现原子错排。
Molecular dynamics simulations were employed to study the nanometric machining process of single crystal γ-TiAl alloy. The influences of different cutting speeds and cutting depths on nanometric cutting process of single crystal γ-TiAl alloy were discussed by molecular dynamics modeling, calculation and analysis. The results show that the accumulated volume of chips increases with the cutting depth increasing 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 is decreased with the cutting speed increasing. In a certain range of cutting depth and speed, in front of the tool will produce "V"-type dislocation ring of the cutting process, and the temperature and potential energy of the workpiece will increase correspondingly. When the cutting speed is 400 m/s, in particular, there is no atomic misalignment on the cutting surface in front of the tool.
Molecular dynamics simulations were employed to study the nanometric machining process of single crystal γ-TiAl alloy. The influences of different cutting speeds and cutting depths on nanometric cutting process of single crystal γ-TiAl alloy were discussed by molecular dynamics modeling, calculation and analysis. The results show that the accumulated volume of chips increases with the cutting depth increasing 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 is decreased with the cutting speed increasing. In a certain range of cutting depth and speed, in front of the tool will produce "V"-type dislocation ring of the cutting process, and the temperature and potential energy of the workpiece will increase correspondingly. When the cutting speed is 400 m/s, in particular, there is no atomic misalignment on the cutting surface in front of the tool.
引文
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[2]Wang Y,Shi J,Ji C.Applied Physics A[J],2014,115(4):1263
[3]Zhu Z X,Gong Y D,Zhou Y G et al.Scientia Sinica Technologica[J],2016,59(6):867
[4]Wang Q,Bai Q,Chen J et al.Applied Surface Science[J],2015,344:38
[5]Gong Y D,Zhu Z X,Zhou Y G et al.Scientia Sinica Technologica[J],2016,59(12):1
[6]Goel S,Kovalchenko A,Stukowski A et al.Acta Materialia[J],2016,105:464
[7]Appel F,Clemens H,Fischer F D.Progress in Materials Science[J],2016,81:55
[8]Schwaighofer E,Rashkova B,Clemens H et al.Intermetallics[J],2014,46:173
[9]Tang F L,Cai H M,Bao H W et al.Computational Materials Science[J],2014,84:232
[10]Hao S U,Tang Q H.Scientia Sinica Technologica[J],2014,57(12):2426
[11]Zope R R,Mishin Y.Physical Review B[J],2003,68(2):366
[12]Zhu Ying(朱瑛),Zhang Yincheng(张银成),Qi Shunhe(齐顺河)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,45(4):897
[13]Kelchner C L,Plimpton S J,Hamilton J C.Physical Review B[J],1998,58(17):11 085
[14]Rao S I,Varvenne C,Woodward C et al.Acta Materialia[J],2017,125:311
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[16]Hull D,Bacon D J.Introduction to Dislocations,Fifth Edition[M].Oxford:Butterworth-Heinemann,2011
[17]Guo Y B,Liang Y C.Transactions of Nonferrous Metals Society of China[J],2012,22(11):2762