Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing

IMR OpenIR

	Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing
	CunLei Jia 1; ZhiWei Wang 1; LiHui Wu 1; DingRui Ni 1; ZhengKun Li 1; HuaMeng Fu 1; Peng Xue 1; BoLv Xiao 1; ZongYi Ma 1; Yi Shao 2; YunLong Chang 2
	2020
发表期刊	金属学报:英文版
ISSN	1006-7191
卷号	33.0 期号:007 页码:947-956
摘要	High-entropy alloys(HEAs) are a new class of materials with a potential engineering application,but how to obtain ultrafine or nano-sized crystal structures of HEAs has been a challenge.Here,we first presented an equiatomic CoCrFeNiCu HEA with excellent mechanical properties obtained via friction stir processing(FSP).After FSP,the Cu element segregation in the cast CoCrFeNiCu HEA was almost eliminated,and the cast coarse two-phase structure(several micrometers) was changed into an ultrafine-grained single-phase structure(150 nm) with a large fraction of high-angle grain boundaries and nanoscale deformation twins.This unique microstructure was mainly attributed to the severe plastic deformation during FSP,and the sluggish diffusion effect in dynamics and the lattice distortion effect in crystallography for HEAs.Furthermore,FSP largely improved the hardness and yield strength of the CoCrFeNiCu HEA with a value of 380 HV and more than 1150 MPa,respectively,which were> 1.5 times higher than those of the base material.The great strengthening after FSP was mainly attributed to the significant grain refinement with large lattice distortion and nano-twins.This study provides a new method to largely refine the microstructure and improve the strength of cast CoCrFeNiCu HEAs.
关键词	grain microstructure deformation
收录类别	CSCD
语种	中文
WOS记录号	WOS:000538493700005
CSCD记录号	CSCD:6755373
引用统计	被引频次：46[WOS] [WOS记录] [WOS相关记录] 被引频次：14[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/89937
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.School of Material Science and Engineering,Shenyang University of Technology
推荐引用方式 GB/T 7714	CunLei Jia,ZhiWei Wang,LiHui Wu,et al. Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing[J]. 金属学报:英文版,2020,33.0(007):947-956.
APA	CunLei Jia.,ZhiWei Wang.,LiHui Wu.,DingRui Ni.,ZhengKun Li.,...&YunLong Chang.(2020).Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing.金属学报:英文版,33.0(007),947-956.
MLA	CunLei Jia,et al."Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing".金属学报:英文版 33.0.007(2020):947-956.