The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation

doi:10.1007/s11433-017-9076-8

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	The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation
	Wei YJ(魏宇杰); Peng SY(彭神佑); Wei, YJ (reprint author), Chinese Acad Sci, Inst Mechan, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.; Wei, YJ (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China.
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2017-11-01
卷号	60 期号:11
关键词	Dislocation Mobility Transverse And Longitudinal Phonons Subsonic And Supersonic Velocity Stress-velocity Relationship Molecular Dynamics
ISSN号	1674-7348
DOI	10.1007/s11433-017-9076-8
文献子类	Article
英文摘要	The dependence of dislocation mobility on stress is the fundamental ingredient for the deformation in crystalline materials. Strength and ductility, the two most important properties characterizing mechanical behavior of crystalline metals, are in general governed by dislocation motion. Recording the position of a moving dislocation in a short time window is still challenging, and direct observations which enable us to deduce the speed-stress relationship of dislocations are still missing. Using large-scale molecular dynamics simulations, we obtain the motion of an obstacle-free twinning partial dislocation in face centred cubic crystals with spatial resolution at the angstrom scale and picosecond temporal information. The dislocation exhibits two limiting speeds: the first is subsonic and occurs when the resolved shear stress is on the order of hundreds of megapascal. While the stress is raised to gigapascal level, an abrupt jump of dislocation velocity occurs, from subsonic to supersonic regime. The two speed limits are governed respectively by the local transverse and longitudinal phonons associated with the stressed dislocation, as the two types of phonons facilitate dislocation gliding at different stress levels.
分类号	二类/Q1
WOS关键词	EMBEDDED-ATOM-METHOD ; SIMULATING MATERIALS FAILURE ; WORLDS FASTEST COMPUTER ; ONE BILLION ATOMS ; ATOMISTIC SIMULATIONS ; MOLECULAR-DYNAMICS ; SCREW DISLOCATION ; MAXIMUM STRENGTH ; MOBILITY ; METALS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000414330200002
资助机构	National Natural Science Foundation of China(11425211)
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/71940]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Wei, YJ (reprint author), Chinese Acad Sci, Inst Mechan, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.; Wei, YJ (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China.
推荐引用方式 GB/T 7714	Wei YJ,Peng SY,Wei, YJ ,et al. The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2017,60(11).
APA	魏宇杰,彭神佑,Wei, YJ ,&Wei, YJ .(2017).The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,60(11).
MLA	魏宇杰,et al."The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 60.11(2017).