Stacking fault induced hardening and grain size effect in nanocrystalline CoNiCrFeMn high-entropy alloy

doi:10.1016/j.eml.2022.101875

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Stacking fault induced hardening and grain size effect in nanocrystalline CoNiCrFeMn high-entropy alloy
	Liu, Renguang 2,3; Tang, Jing 3; Jiang, Jiaxi 1; Li, Xiaoyan 1; Wei, Yujie 2,3
刊名	EXTREME MECHANICS LETTERS
	2022-10-01
卷号	56 页码:6
关键词	High entropy alloys Stacking fault energy Strengthening Dislocations Hall-Petch
ISSN号	2352-4316
DOI	10.1016/j.eml.2022.101875
通讯作者	Wei, Yujie(yujie_wei@lnm.imech.ac.cn)
英文摘要	A broad variation of stacking fault energy (SFE) in high entropy alloys (HEAs) gives rise to rich deformation mechanisms and unique mechanical properties of HEAs. In this paper, we aim to reveal the interplay between grain boundaries and stacking faults in governing the strength and flow stress of CoNiCrFeMn HEA. We carried out atomistic simulations for the tension of polycrystalline CoNiCrFeMn HEA of different grain sizes from 3.0 to 48.6 nm at different temperatures. The tensile flow stress of the HEA follows the traditional Hall-Petch (HP) relation till grain size is down to 15.0 nm. Massive stacking faults contribute to the extra hardening and render a rather gradual drop of flow stress with increasing grain size: In the regime governed by HP relation, partial dislocations emitting from grain boundaries are primarily leading partials; and resulted stacking fault (SF) can serve as barriers to dislocation gliding on intersecting planes. This mild hardening mechanism complements strong hardening from grain boundaries. We expect SF induced hardening could be general in polycrystalline HEAs. The findings reported here may provide a basis and engineering guidance for strengthening and toughening the design of a broad range of HEAs characterized by a wide spectrum of SFEs.(c) 2022 The Author(s). Published by Elsevier Ltd.
资助项目	National Natural Science Foundation of China (NSFC) Basic Science Center[11988102]
WOS关键词	HALL-PETCH RELATIONSHIP
WOS研究方向	Engineering ; Materials Science ; Mechanics
语种	英语
WOS记录号	WOS:000862816200007
资助机构	National Natural Science Foundation of China (NSFC) Basic Science Center
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90361]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Wei, Yujie
作者单位	1.Tsinghua Univ, Ctr Adv Mech & Mat, Dept Engn Mech, Appl Mech Lab, Beijing 100084, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Liu, Renguang,Tang, Jing,Jiang, Jiaxi,et al. Stacking fault induced hardening and grain size effect in nanocrystalline CoNiCrFeMn high-entropy alloy[J]. EXTREME MECHANICS LETTERS,2022,56:6.
APA	Liu, Renguang,Tang, Jing,Jiang, Jiaxi,Li, Xiaoyan,&Wei, Yujie.(2022).Stacking fault induced hardening and grain size effect in nanocrystalline CoNiCrFeMn high-entropy alloy.EXTREME MECHANICS LETTERS,56,6.
MLA	Liu, Renguang,et al."Stacking fault induced hardening and grain size effect in nanocrystalline CoNiCrFeMn high-entropy alloy".EXTREME MECHANICS LETTERS 56(2022):6.