Cu alloying enables superior strength-ductility combination and high corrosion resistance of FeMnCoCr high entropy alloy

doi:10.1016/j.jallcom.2023.172543

IMR OpenIR

	Cu alloying enables superior strength-ductility combination and high corrosion resistance of FeMnCoCr high entropy alloy
	Yuan, Y.1; Wang, J. J.1; Wei, J.2; Chen, W. Y.3; Yan, H. L.1; Jia, N.1
通讯作者	Wei, J.(jwei@imr.ac.cn) ; Jia, N.(jian@atm.neu.edu.cn)
	2024-01-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	970 页码:15
摘要	The metastable dual phase FeMnCoCr high entropy alloy (HEA) has attracted great attention since it was first proposed, as it can overcome the strength -ductility trade-off at room temperature. For materials in engineering applications, it is also important to achieve high corrosion resistance while maintaining good mechanical properties. In this study, we simultaneously improved the mechanical properties and corrosion resistance of a FeMnCoCr-based HEA via Cu alloying and by applying a simple processing route that combined cold rolling and partial recrystallization annealing. The alloy doped with 0.3 at.% Cu and processed by annealing at 650 C for 3 min exhibited the best combination of strength and ductility, i.e., yield strength of 768 MPa, tensile strength of 960 MPa and uniform elongation of 33.6%. The high yield strength majorly originated from high density dislocations and grain boundaries in the material, while the formation of deformation twins, martensite laths, stacking faults and Lomer Cottrell locks contributed to the continuous strain hardening and good ductility. The addition of Cu also enhanced corrosion resistance of the HEA in a NaCl solution by improving stability of the alloy matrix and elevating compactness of the passive film. The solid solution of Cu elevated equilibrium potential of the matrix and promotes transformation of microstructure from the face -centered cubic (fcc) plus hexagonal close -packed (hcp) dual phases to the fcc single phase, effectively inhibiting the accelerated corrosion of micro galvanic couple between different phases and enhancing stability of the matrix. At the same time, the enrichment of CuO in the inner layer of the passive film reduced the defect density within the Fe -rich oxide layer, improving the protection of the passive film against the matrix.
关键词	High entropy alloy Cu alloying Mechanical properties Deformation mechanism Corrosion resistance
资助者	National Key Research and Devel- opment Program ; National Natural Science Foundation of China
DOI	10.1016/j.jallcom.2023.172543
收录类别	SCI
语种	英语
资助项目	National Key Research and Devel- opment Program[2021YFA1200203] ; National Natural Science Foundation of China[52371097] ; National Natural Science Foundation of China[51922026]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001162297000001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：20[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/321006/184330
专题	中国科学院金属研究所
通讯作者	Wei, J.; Jia, N.
作者单位	1.Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China 2.Inst Met Sci & Technol, Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Ningxia, Peoples R China
推荐引用方式 GB/T 7714	Yuan, Y.,Wang, J. J.,Wei, J.,et al. Cu alloying enables superior strength-ductility combination and high corrosion resistance of FeMnCoCr high entropy alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2024,970:15.
APA	Yuan, Y.,Wang, J. J.,Wei, J.,Chen, W. Y.,Yan, H. L.,&Jia, N..(2024).Cu alloying enables superior strength-ductility combination and high corrosion resistance of FeMnCoCr high entropy alloy.JOURNAL OF ALLOYS AND COMPOUNDS,970,15.
MLA	Yuan, Y.,et al."Cu alloying enables superior strength-ductility combination and high corrosion resistance of FeMnCoCr high entropy alloy".JOURNAL OF ALLOYS AND COMPOUNDS 970(2024):15.