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Supersonic Screw Dislocations Gliding at the Shear Wave Speed
Peng SY(彭神佑); Wei YJ(魏宇杰); Jin ZH; Yang W(杨卫)
Source PublicationPHYSICAL REVIEW LETTERS
2019-01-29
Volume122Issue:4Pages:045501
ISSN0031-9007
Abstract

The motion of dislocations bridges the atomistic-scale deformation events with the macroscopic strength and ductility of crystalline metals. In particular, screw dislocations, whose Burgers vector is parallel to the line, play crucial roles on plastic flow. Nevertheless, their speed limit and its stress dependence remain controversial. Using large-scale molecular dynamics simulations, we reveal that full screw dislocations and twinning partial screw-type dislocations can glide steadily at the speed of shear wave velocity. Such a scenario is excluded in existing theories due to energy dissipation singularity. We conclude that both types of screw dislocations can move supersonically. We further observe that the motion of a screw dislocation also depends on the shear stress components, which do not contribute to the resolved shear stress (RSS), in contrast to the conventional Schmid’s law, which states that the motion of a dislocation is determined by the RSS.

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DOI10.1103/PhysRevLett.122.045501
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000457061400006
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/78285
Collection非线性力学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
2.Shanghai Jiao Tong Univ, Light Alloy Net Forming Natl Engn Res Ctr, Shanghai 200240, Peoples R China
3.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
4.Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Zhejiang, Peoples R China
5.Zhejiang Univ, Ctr X Mech, Hangzhou 310027, Zhejiang, Peoples R China
6.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Peng SY,Wei YJ,Jin ZH,et al. Supersonic Screw Dislocations Gliding at the Shear Wave Speed[J]. PHYSICAL REVIEW LETTERS,2019,122(4):045501.
APA 彭神佑,魏宇杰,Jin ZH,&杨卫.(2019).Supersonic Screw Dislocations Gliding at the Shear Wave Speed.PHYSICAL REVIEW LETTERS,122(4),045501.
MLA 彭神佑,et al."Supersonic Screw Dislocations Gliding at the Shear Wave Speed".PHYSICAL REVIEW LETTERS 122.4(2019):045501.
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