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	Molecular dynamics simulation of nanoscale friction process
	Liu Xiaoming ; You Xiaochuan ; Liu Zhanli ; Zhuang Zhuo
	2010-10-12 ; 2010-10-12
关键词	Theoretical or Mathematical/ dislocation loops friction molecular dynamics method nanostructured materials nickel nucleation phonons plastic deformation slip/ molecular dynamics simulation nanoscale friction process nanoscratch process rigid diamond tip Ni single crystal EAM potential scratch depth microstructures dislocation loops stick-slip phenomenon dislocation emission phonon dissipation sawtooth phenomena elastic energy plastic deformation Ni/ A8140P Friction, lubrication, and wear A6220P Tribology A6146 Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials A6170L Slip, creep, internal friction and other indirect evidence of dislocations A6320D Phonon states and bands, normal modes, and phonon dispersion A8140L Deformation, plasticity and creep A6220F Deformation and plasticity/ Ni/sur Ni/el
中文摘要	The nano-scratch process of a rigid diamond tip into Ni single crystal has been studied by using molecular dynamics simulation with EAM potential. The effects of scratch depth on the friction force, microstructures around the tip and formation of dislocation loops in the scratch process were analyzed. It is revealed that the stick-slip phenomenon is resulting from dislocation emission and phonon dissipation. The sawtooth phenomena can be explained as that elastic energy stored in the stick process transforms to the dislocations beneath the tip, and then dissipates in the form of phonons, and finally forms the surface defects. Finally, simulation also shows that the scratch velocity is the critical factor on the dislocation loop nucleation and evolution process. At the higher velocity, dislocation loops glide along slip plane downward to the bulk material. At the lower velocity, dislocation loops beneath the tip will react with each other to form a large loop under the subsurface of the material, and plastic deformation will concentrate on the subsurface of the material.
语种	中文
出版者	Science Press ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78978]
专题	清华大学
推荐引用方式 GB/T 7714	Liu Xiaoming,You Xiaochuan,Liu Zhanli,et al. Molecular dynamics simulation of nanoscale friction process[J],2010, 2010.
APA	Liu Xiaoming,You Xiaochuan,Liu Zhanli,&Zhuang Zhuo.(2010).Molecular dynamics simulation of nanoscale friction process..
MLA	Liu Xiaoming,et al."Molecular dynamics simulation of nanoscale friction process".(2010).

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