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

文献类型：期刊论文

作者Zhang, Zihan1,2; Wang, Wei2; Qin, Shuang2; Yang, Muxin2; Wang, Jing2; Jiang, Ping2; Yuan, Fuping1,2; Wu, Xiaolei1,2; Wu XL(武晓雷); Tan S(覃双)
刊名JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
出版日期2022-03-01
卷号17页码:3262-3276
ISSN号2238-7854
关键词High entropy alloys Dual heterogeneous structures Precipitates Strain hardening Cryogenic properties
DOI10.1016/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.
WOS关键词STRAIN-GRADIENT PLASTICITY ; CHARPY IMPACT PROPERTIES ; MECHANICAL-PROPERTIES ; INTERNAL-STRESSES ; DEFORMATION ; STEEL ; TENSILE ; CRCONI ; MN ; BEHAVIOR
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
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
通讯作者Yuan, Fuping
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, Zihan,Wang, Wei,Qin, Shuang,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 Zhang, Zihan.,Wang, Wei.,Qin, Shuang.,Yang, Muxin.,Wang, Jing.,...&张子晗.(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 Zhang, Zihan,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.

入库方式： OAI收割

来源：力学研究所

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