Harnessing instability for work hardening in multi-principal element alloys

doi:10.1038/s41563-024-01871-7

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	Harnessing instability for work hardening in multi-principal element alloys
	Xu BW(徐博文); Duan, Huichao; Chen XF(陈雪飞); Wang J(王晶); Ma Y(马彦); Jiang P(姜萍); Yuan FP(袁福平); Wang, Yandong; Ren, Yang; Du, Kui
刊名	NATURE MATERIALS
	2024-04-11
页码	16
ISSN号	1476-1122
DOI	10.1038/s41563-024-01871-7
通讯作者	Wu, Xiaolei(xlwu@imech.ac.cn)
英文摘要	The strength-ductility trade-off has long been a Gordian knot in conventional metallic structural materials and it is no exception in multi-principal element alloys. In particular, at ultrahigh yield strengths, plastic instability, that is, necking, happens prematurely, because of which ductility almost entirely disappears. This is due to the growing difficulty in the production and accumulation of dislocations from the very beginning of tensile deformation that renders the conventional dislocation hardening insufficient. Here we propose that premature necking can be harnessed for work hardening in a VCoNi multi-principal element alloy. Luders banding as an initial tensile response induces the ongoing localized necking at the band front to produce both triaxial stress and strain gradient, which enables the rapid multiplication of dislocations. This leads to forest dislocation hardening, plus extra work hardening due to the interaction of dislocations with the local-chemical-order regions. The dual work hardening combines to restrain and stabilize the premature necking in reverse as well as to facilitate uniform deformation. Consequently, a superior strength-and-ductility synergy is achieved with a ductility of similar to 20% and yield strength of 2 GPa during room-temperature and cryogenic deformation. These findings offer an instability-control paradigm for synergistic work hardening to conquer the strength-ductility paradox at ultrahigh yield strengths.
分类号	一类
资助项目	National Natural Science Foundation of China (National Science Foundation of China)[2019YFA0209900] ; National Key Research and Development Program of China, Ministry of Science and Technology ; Strategic Priority Research Program[XDB0510300] ; Strategic Priority Research Program[XDB22040503] ; Chinese Academy of Sciences[202305AF150014] ; Academician-&-Expert Workstation[11988102] ; Academician-&-Expert Workstation[52192591] ; Academician-&-Expert Workstation[11972350] ; Nature Science Foundation of China (NSFC)[11890681] ; NSFC[9610533] ; City University of Hong Kong
WOS关键词	MEDIUM-ENTROPY ALLOY ; SHORT-RANGE ORDER ; STRAIN FIELDS ; HIGH-STRENGTH ; STRESS ; DISLOCATIONS ; ULTRASTRONG ; DUCTILITY ; STEELS
WOS研究方向	Chemistry ; Materials Science ; Physics
语种	英语
WOS记录号	WOS:001200732900003
资助机构	National Natural Science Foundation of China (National Science Foundation of China) ; National Key Research and Development Program of China, Ministry of Science and Technology ; Strategic Priority Research Program ; Chinese Academy of Sciences ; Academician-&-Expert Workstation ; Nature Science Foundation of China (NSFC) ; NSFC ; City University of Hong Kong
其他责任者	Wu, Xiaolei
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/95617]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Xu BW,Duan, Huichao,Chen XF,et al. Harnessing instability for work hardening in multi-principal element alloys[J]. NATURE MATERIALS,2024:16.
APA	徐博文.,Duan, Huichao.,陈雪飞.,王晶.,马彦.,...&武晓雷.(2024).Harnessing instability for work hardening in multi-principal element alloys.NATURE MATERIALS,16.
MLA	徐博文,et al."Harnessing instability for work hardening in multi-principal element alloys".NATURE MATERIALS (2024):16.