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

doi:10.1016/j.ijplas.2021.103155

IMECH-IR > 非线性力学国家重点实验室

	Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy
	Dai SC(戴仕诚)1,2; Xie ZC(谢周璨)1,2; Wang YJ(王云江)1,2
通讯作者	Wang, Yun-Jiang(yjwang@imech.ac.cn)
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
	2022-02-01
卷号	149 页码:16
ISSN	0749-6419
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.
关键词	Multi-principal-element alloy Dislocation nucleation Rate and temperature sensitivity Minimum energy pathway Molecular dynamics
DOI	10.1016/j.ijplas.2021.103155
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000788358900001
关键词[WOS]	SHORT-RANGE ORDER ; HIGH-ENTROPY ; TRACER DIFFUSION ; METALLIC GLASSES ; CROSS-SLIP ; STRENGTH ; DEFORMATION ; DYNAMICS ; MECHANISMS ; PLASTICITY
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
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]
项目资助者	National Natural Science Foundation of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences
论文分区	一类
力学所作者排名	1
RpAuthor	Wang, Yun-Jiang
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/89091
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
推荐引用方式 GB/T 7714	Dai SC,Xie ZC,Wang YJ. 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	戴仕诚,谢周璨,&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	戴仕诚,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.

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