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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.
2017-11-01
发表期刊SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
卷号60期号:11
ISSN1674-7348
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.
关键词Dislocation Mobility Transverse And Longitudinal Phonons Subsonic And Supersonic Velocity Stress-velocity Relationship Molecular Dynamics
DOI10.1007/s11433-017-9076-8
收录类别SCI ; EI ; CSCD
语种英语
WOS记录号WOS:000414330200002
关键词[WOS]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
WOS类目Physics, Multidisciplinary
项目资助者National Natural Science Foundation of China(11425211)
课题组名称LNM微结构计算力学
论文分区二类/Q1
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/71940
专题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.
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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).
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