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Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy

文献类型：期刊论文

作者Dai, Shi-Cheng1,2; Xie, Zhou-Can1,2; Wang, Yun-Jiang1,2; Wang YJ(王云江)
刊名INTERNATIONAL JOURNAL OF PLASTICITY
出版日期2022-02-01
卷号149页码:16
ISSN号0749-6419
关键词Multi-principal-element alloy Dislocation nucleation Rate and temperature sensitivity Minimum energy pathway Molecular dynamics
DOI10.1016/j.ijplas.2021.103155
通讯作者Wang, Yun-Jiang(yjwang@imech.ac.cn)
英文摘要Incipient plasticity of crystals is usually initiated from versatile pre-existing crystalline defects of different geometries and length scales that formed during materials fabrication and processing, which is closely associated with the mechanical properties. Here we study the heterogeneous dislocation nucleation behaviors from an existing nanoscale void embedded in a prototypical multi-principal-element (MPE) NiCoCr alloy via atomistical exploration of possible minimum energy pathways and analyzes of the dislocation kinetics by a continuum-level mechanistic model, in comparison with the same plastic mechanism in an elemental face-centered cubic copper. It is found that the rough nucleation pathway of dislocation brings about extra thermal softening and strain-rate sensitivity for the critical nucleation stress of dislocation in the MPE alloy, which reproduces the experimental observations. The extra temperature softening is revealed to be associated with the high total entropy of the MPE alloy, in which the configurational entropy plays a dominating role rather than the vibrational counterpart. The extra strain rate sensitivity is caused by the relatively small activation volume in MPE alloy. Our strategy offers physical understanding of the experimental phenomena with atomistic details, which also emphasizes the critical role of configurational disorder in the dislocation accommodated plasticity in the generic complex concentrated alloys.
WOS关键词SHORT-RANGE ORDER ; HIGH-ENTROPY ; TRACER DIFFUSION ; METALLIC GLASSES ; CROSS-SLIP ; STRENGTH ; DEFORMATION ; DYNAMICS ; MECHANISMS ; PLASTICITY
资助项目National Natural Science Foundation of China[12072344] ; National Key Research and Development Program of China[2017YFB0701502] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2017025]
WOS研究方向Engineering ; Materials Science ; Mechanics
语种英语
WOS记录号WOS:000788358900001
资助机构National Natural Science Foundation of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences
源URL[http://dspace.imech.ac.cn/handle/311007/89090]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Wang, Yun-Jiang
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Dai, Shi-Cheng,Xie, Zhou-Can,Wang, Yun-Jiang,et al. Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2022,149:16.
APA Dai, Shi-Cheng,Xie, Zhou-Can,Wang, Yun-Jiang,&王云江.(2022).Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy.INTERNATIONAL JOURNAL OF PLASTICITY,149,16.
MLA Dai, Shi-Cheng,et al."Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy".INTERNATIONAL JOURNAL OF PLASTICITY 149(2022):16.

入库方式： OAI收割

来源：力学研究所

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