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Title:
The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation
Author: Wei YJ(魏宇杰); Peng SY(彭神佑)
Source: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Issued Date: 2017-11-01
Volume: 60, Issue:11
Abstract: 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.
Keyword: dislocation mobility ; transverse and longitudinal phonons ; subsonic and supersonic velocity ; stress-velocity relationship ; molecular dynamics
Language: 英语
Indexed Type: SCI ; EI ; CSCD
Corresponding Author: 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.
Correspondent Email: yujie_wei@lnm.imech.ac.cn
DOI: 10.1007/s11433-017-9076-8
DOC Type: Article
WOS Subject: Physics, Multidisciplinary
WOS Subject Extended: Physics
WOS Keyword Plus: EMBEDDED-ATOM-METHOD ; SIMULATING MATERIALS FAILURE ; WORLDS FASTEST COMPUTER ; ONE BILLION ATOMS ; ATOMISTIC SIMULATIONS ; MOLECULAR-DYNAMICS ; SCREW DISLOCATION ; MAXIMUM STRENGTH ; MOBILITY ; METALS
WOS ID: WOS:000414330200002
ISSN: 1674-7348
Funder: National Natural Science Foundation of China(11425211)
Department: LNM微结构计算力学
Classification: 二类/Q1
Ranking: 1
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/71940
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Wei YJ,Peng SY. The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2017-11-01,60(11).
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