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Hetero-deformation-induced (HDI) plasticity induces simultaneous increase in both yield strength and ductility in a Fe50Mn30Co10Cr10 high-entropy alloy

文献类型：期刊论文

作者Liu D(刘动)2,3; Wang J(王晶)3; Wang, Chang1; Jiang P(姜萍)3; Yuan FP(袁福平)2,3; Wu XL(武晓雷)2,3
刊名APPLIED PHYSICS LETTERS
出版日期2021-09-27
卷号119期号:13页码:6
ISSN号0003-6951
DOI10.1063/5.0065148
通讯作者Wu, Xiaolei(xlwu@imech.ac.cn)
英文摘要Low yield strength is the bottleneck of the face-centered cubic-structured high-entropy alloys (HEAs). Here, the strategy of hetero-deformation-induced (HDI) plasticity is applied by hetero-structuring to induce strengthening and strain hardening for a simultaneous increase in both yield strength and ductility in a Fe50Mn30Co10Cr10 HEA. The coarse-grain (CG) microstructure is a dual phase consisting of face-centered cubic (gamma) and hexagonal close-packed (epsilon) phases, along with phase transformation from gamma to epsilon to happen during tensile deformation. The hetero-structure (HS) was designed, besides recrystallized gamma and epsilon, specifically to reserve a part of deformed gamma after cold rolling followed by incomplete recrystallization. Yield strength increases from 200MPa in CG to 760MPa in HS, while uniformsy elongation (i.e., ductility) increases from 35% to 38%. The tensile load-unload-reload testing showed the ceaselessly presence of hysteresis loop during each unload-reload cycle. Both the residual plastic strain and HDI stress were measured with tensile strains in both HS and CG, providing solid evidence of the effect of HDI plasticity. To be specific, the HDI stress is found to account for a large proportion of global flow stress in HS as compared to that in CG. It turns out that the HDI plasticity facilitates both HDI strengthening and HDI strain hardening, which play the crucial role in enhancing strength and ductility. The microstructural origin of HDI plasticity in HS was ascribed to plastic incompatibility at hetero-interfaces of among varying grains as evidenced by the evolution of Schmid factor and KAM values as well. (C) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution
WOS关键词HETEROGENEOUS LAMELLA STRUCTURE ; GRADIENT
资助项目Ministry of Science and Technology of China[2019YFA0209900] ; Ministry of Science and Technology of China[2017YFA0204402] ; National Natural Science Foundation of China, NSFC[11988102] ; National Natural Science Foundation of China, NSFC[11972350] ; National Natural Science Foundation of China, NSFC[11890680]
WOS研究方向Physics
语种英语
WOS记录号WOS:000753139300014
资助机构Ministry of Science and Technology of China ; National Natural Science Foundation of China, NSFC
其他责任者Wu, Xiaolei
源URL[http://dspace.imech.ac.cn/handle/311007/88584]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Cent Iron & Steel Res Inst, Special Steel Dept, Beijing 100081, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Liu D,Wang J,Wang, Chang,et al. Hetero-deformation-induced (HDI) plasticity induces simultaneous increase in both yield strength and ductility in a Fe50Mn30Co10Cr10 high-entropy alloy[J]. APPLIED PHYSICS LETTERS,2021,119(13):6.
APA 刘动,王晶,Wang, Chang,姜萍,袁福平,&武晓雷.(2021).Hetero-deformation-induced (HDI) plasticity induces simultaneous increase in both yield strength and ductility in a Fe50Mn30Co10Cr10 high-entropy alloy.APPLIED PHYSICS LETTERS,119(13),6.
MLA 刘动,et al."Hetero-deformation-induced (HDI) plasticity induces simultaneous increase in both yield strength and ductility in a Fe50Mn30Co10Cr10 high-entropy alloy".APPLIED PHYSICS LETTERS 119.13(2021):6.

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来源：力学研究所

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