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Enhanced strength-ductility synergy in a gradient hetero-structured CrCoNi medium-entropy alloy

文献类型：期刊论文

作者Feng HQ(冯航旗)3,4; Zhang HZ(张杭州)2,3; He ZH(何政鸿)2,3; Zhou LL(周玲玲)2,3; Zhang ZH(张子晗)2,3; Yang MX(杨沐鑫)2,3; Li,Weijie1; Wu XL(武晓雷)2,3; Yuan FP(袁福平)2,3; Li,Ying1
刊名JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
出版日期2024-11-01
卷号33页码:7491-7502
关键词Gradient nanostructures Hetero-structures Strain hardening Strength-ductility synergy Medium-entropy alloys
ISSN号2238-7854
DOI10.1016/j.jmrt.2024.11.068
通讯作者Yang, Muxin(mxyang@lnm.imech.ac.cn) ; Li, Ying(bitliying@bit.edu.cn)
英文摘要A CrCoNi medium-entropy alloy (MEA) with gradient hetero-structure (GHS) composing of gradient nanostructured surface layer and hetero-structured matrix was prepared via a two-step process: pre-cold rolling (CR) deformation and subsequent annealing followed by surface mechanical grinding treatment (SMGT) and secondary annealing. The GHS CrCoNi exhibits an excellent synergy of strength and ductility, as evidenced by a yield strength of approximately 1.2 GPa and a uniform elongation of about 20%. The GHS displays a pronounced hetero-deformation induced (HDI) hardening effect, whereby the central layer (CL) and surface layer (SL) undergo local strain hardening in a mutually compatible manner. This process facilitates the multiplication and accumulation of geometrically necessary dislocations (GNDs) at intra- and inter-layer hetero-interfaces and also activates the deformation faulting and twinning in both CL and SL, thus enhancing the overall mechanical response. The interlayer compatible deformation observed in the GHS significantly bolsters the sustainability of strain hardening at the microscopic scale. This effect is of significant importance in redistributing stress and strain more rationally across the entire GHS sample, effectively reducing the risk of localized deformation failures. This study offers insight into the correlation between macroscopic strain hardening and micromechanical behavior in gradient-/hetero-structured materials.
分类号一类
WOS关键词SHORT-RANGE ORDER ; SURFACE-LAYER ; MECHANICAL-PROPERTIES ; DEFORMATION ; PLASTICITY ; IMPACT ; STRESS
资助项目National Key R&D Program of China[2019YFA0209902] ; Natural Science Foundation of China[52225108] ; Natural Science Foundation of China[52071326] ; Natural Science Foundation of China[52171290] ; Natural Science Foundation of China[52192593] ; Natural Science Foundation of China[51601204] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; 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:001360048700001
资助机构National Key R&D Program of China ; Natural Science Foundation of China ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者Yang, Muxin ; Li, Ying
源URL[http://dspace.imech.ac.cn/handle/311007/97504]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Beijing Inst Technol, State Key Lab Explos Sci & Technol, 5 Zhongguancun South St, Beijing 100081, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China;
4.Wuhan Univ Technol, Sch Naval Architecture Ocean & Energy Power Engn, 1178 Heping Rd, Wuhan 430070, Peoples R China;
推荐引用方式
GB/T 7714		 Feng HQ,Zhang HZ,He ZH,et al. Enhanced strength-ductility synergy in a gradient hetero-structured CrCoNi medium-entropy alloy[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2024,33:7491-7502.
APA 冯航旗.,张杭州.,何政鸿.,周玲玲.,张子晗.,...&Li,Ying.(2024).Enhanced strength-ductility synergy in a gradient hetero-structured CrCoNi medium-entropy alloy.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,33,7491-7502.
MLA 冯航旗,et al."Enhanced strength-ductility synergy in a gradient hetero-structured CrCoNi medium-entropy alloy".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 33(2024):7491-7502.

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来源：力学研究所

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