a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b

doi:10.1016/j.matchar.2024.113970

IMR OpenIR

	*a,b , a,b, , a,b , a,b , a , a,b , a,b , a,b**
	Li, N.1,2; Wu, L. H.1,2; Zhang, H.1,2; Xue, P.1,2; Liu, F. C.1; Ni, D. R.1,2; Xiao, B. L.1,2; Ma, Z. Y.1,2
通讯作者	Wu, L. H.(lhwu@imr.ac.cn)
	2024-06-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	212 页码:11
摘要	Since superplastic formation offers a significant advantage in preparing the complex structure parts of HEAs, the study of their superplastic behavior is extremely important. Using friction stir processing (FSP) with an improved convex hemispherical shape tool, this study reported for the first time an equiaxed ultrafine-grained CoCrFeNiMn HEA (489 nm) with a maximum elongation of 870% at 675 degrees C and 3 x 10-4 s-1. This superplastic property is much larger than ever reported in the CoCrFeNiMn HEA, which is even larger than that of the nano-sized CoCrFeNiMn HEA (10 nm) prepared by the high-pressure torsion. A high proportion of high angle grain boundaries and twin boundaries, a hard Cr-rich phase, and the sluggish diffusion effect of the CoCrFeNiMn HEA were primarily responsible for the exceptional superplasticity. Additionally, this study provides the first elucidation of the mechanism underlying Cr precipitation and Cr-rich phase growth, as well as the function of lowenergy annealed twins during superplastic deformation. The diffusion of Cr along dislocations and grain boundaries facilitated grain boundary sliding as the predominant deformation mechanism. This study elucidates the superplastic deformation mechanism and microstructure evolution, thereby furnishing theoretical guidance for the practical implementation of superplastic forming of complex components of HEAs. Additionally, it presents an efficient method for fabricating such components.
关键词	High entropy alloys Friction stir processing Grain boundary sliding Cr-rich phase
资助者	National Natural Science Foundation of China ; Youth Innova- tion Promotion Association of the Chinese Academy of Sciences ; Liaoning Revitalization Talents Program
DOI	10.1016/j.matchar.2024.113970
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52271043] ; National Natural Science Foundation of China[51975553] ; Youth Innova- tion Promotion Association of the Chinese Academy of Sciences[2021193] ; Liaoning Revitalization Talents Program[XLYC2002099]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001240836900001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/186823
专题	中国科学院金属研究所
通讯作者	Wu, L. H.
作者单位	1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li, N.,Wu, L. H.,Zhang, H.,et al. a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b[J]. MATERIALS CHARACTERIZATION,2024,212:11.
APA	Li, N..,Wu, L. H..,Zhang, H..,Xue, P..,Liu, F. C..,...&Ma, Z. Y..(2024).a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b.MATERIALS CHARACTERIZATION,212,11.
MLA	Li, N.,et al."a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b".MATERIALS CHARACTERIZATION 212(2024):11.