Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature

doi:10.1016/j.jmrt.2022.02.078

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

	Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature
	Zhang ZH(张子晗)1,2; Wang W(王为)2; Tan S(覃双)2; Yang MX(杨沐鑫)2; Wang J(王晶)2; Jiang P(姜萍)2; Yuan FP(袁福平)1,2; Wu XL(武晓雷)1,2
刊名	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
	2022-03-01
卷号	17 页码:3262-3276
关键词	High entropy alloys Dual heterogeneous structures Precipitates Strain hardening Cryogenic properties
ISSN号	2238-7854
DOI	10.1016/j.jmrt.2022.02.078
通讯作者	Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要	The tensile properties and the corresponding deformation mechanisms at both room and cryogenic temperatures for a CoCrNi-based medium entropy alloy with both a homogeneous structure and a dual heterogeneous structure have been studied and compared. The dual heterogeneous structure is found to be composed of both heterogeneous grain structure and coherent L1(2) nanoprecipitates. Both the homogeneous structure and the dual heterogeneous structure show a simultaneous improvement on yield strength and uniform elongation at cryogenic temperature as compared to those at room temperature, which can be attributed to higher hetero-deformation-induced hardening rate and higher density of geometrically necessary dislocations induced at cryogenic temperature. For the homogeneous structure, nano-spaced stacking faults along two slip systems with much smaller interspacing and higher density of Lomer-Cottrell locks should play the essential role in sustaining the strain hardening for better tensile ductility at cryogenic temperature. L1(2) nanoprecipitates are observed to be very effective on blocking dislocation slip and accumulation of dislocations around them. For the dual heterogeneous structure, more intense interactions between defects and L1(2) nanoprecipitates are observed after tensile deformation at cryogenic temperature, resulting in fragmentation and refinement of L1(2) nanoprecipitates for better tensile properties than at room temperature. (C) 2022 The Author(s). Published by Elsevier B.V.
分类号	一类
资助项目	NSFC Basic Science Center Program[11988102] ; National Key R&D Program of China[2017YFA0204402] ; National Natural Science Foundation of China[11790293] ; National Natural Science Foundation of China[52192591] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503]
WOS关键词	STRAIN-GRADIENT PLASTICITY ; CHARPY IMPACT PROPERTIES ; MECHANICAL-PROPERTIES ; INTERNAL-STRESSES ; DEFORMATION ; STEEL ; TENSILE ; CRCONI ; MN ; BEHAVIOR
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000779147700004
资助机构	NSFC Basic Science Center Program ; National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者	Yuan, Fuping
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88871]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 West Rd,North 4th Ring, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Zhang ZH,Wang W,Tan S,et al. Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2022,17:3262-3276.
APA	张子晗.,王为.,覃双.,杨沐鑫.,王晶.,...&武晓雷.(2022).Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,17,3262-3276.
MLA	张子晗,et al."Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 17(2022):3262-3276.