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

doi:10.1016/j.jmrt.2024.11.068

IMECH-IR > 非线性力学国家重点实验室

	Enhanced strength-ductility synergy in a gradient hetero-structured CrCoNi medium-entropy alloy
	Feng HQ(冯航旗)1,2; 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,Weijie 4; Wu XL(武晓雷)2,3 ; Yuan FP(袁福平)2,3 ; Li,Ying4
通讯作者	Yang, Muxin([email protected]) ; Li, Ying([email protected])
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
	2024-11-01
卷号	33 页码:7491-7502
ISSN	2238-7854
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.
关键词	Gradient nanostructures Hetero-structures Strain hardening Strength-ductility synergy Medium-entropy alloys
DOI	10.1016/j.jmrt.2024.11.068
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001360048700001
关键词[WOS]	SHORT-RANGE ORDER ; SURFACE-LAYER ; MECHANICAL-PROPERTIES ; DEFORMATION ; PLASTICITY ; IMPACT ; STRESS
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
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]
项目资助者	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
论文分区	一类
力学所作者排名	1
RpAuthor	Yang, Muxin ; Li, Ying
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/97505
专题	非线性力学国家重点实验室
作者单位	1.Wuhan Univ Technol, Sch Naval Architecture Ocean & Energy Power Engn, 1178 Heping Rd, Wuhan 430070, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China; 4.Beijing Inst Technol, State Key Lab Explos Sci & Technol, 5 Zhongguancun South St, Beijing 100081, 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.Rp_Au:Yang, Muxin, Li, Ying
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.