Solidification evolution and corrosion performance of CoCrFeNiBx eutectic high entropy alloy coatings

doi:10.1016/j.surfcoat.2024.130760

IMR OpenIR

	Solidification evolution and corrosion performance of CoCrFeNiBx eutectic high entropy alloy coatings
	Zhang, Qi 1; Si, Yueqi 2,3; Han, Bin 1; Li, Meiyan 1; Wang, Qin 1; Bian, Wenqi 1; Xue, Xixin 1
通讯作者	Han, Bin(hbzhjh@upc.edu.cn)
	2024-05-15
发表期刊	SURFACE & COATINGS TECHNOLOGY
ISSN	0257-8972
卷号	483 页码:17
摘要	CoCrFeNiBx (x = 0.15, 0.30, 0.45, 0.60, 0.75) eutectic high entropy alloy (EHEA) coatings, abbreviated as B0.15-B0.75, were prepared by laser cladding. The inevitability of solid-state phase transition in B0.75 coating has been verified from the perspective of enthalpy. The solidification and crystallization process and laws of the CoCrFeNiBx coatings were obtained by observing the phase and microstructure, combining the DSC testing and analysis. When the mole ratio of B atoms x <= 0.45, the FCC1 phase solidifies into dendrites, and the eutectic structure composed of the coupling of FCC1 and FCC2 lamellae forms between dendrites. As the content of B increases, the proportion of eutectic structure rises steadily while the dendrites refine and decrease. When x = 0.60, the B content reaches the eutectic point, forming the eutectic structure with a feathery appearance. When x = 0.75, a strip-shaped boride structure will also precipitate after the formation of the metastable eutectic structure. The B element can promote the formation of eutectic structures, thereby improving the microhardness of the CoCrFeNiBx coatings from 267.0 HV0.2 to 555.4 HV0.2. However, as the B content rises, the corrosion current density of the CoCrFeNiBx coating in 3.5 % NaCl solution decreases from 1.08E-07 A/cm2 to 8.92E-06 A/cm2. The corrosion mechanism changes from pitting corrosion to intergranular corrosion. The high-phase interfacial energy of the eutectic structure exacerbates the galvanic corrosion of the coatings.
关键词	CoCrFeNiB x eutectic high entropy alloy coatings Solidification evolution Enthalpy change Microhardness Corrosion resistance
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province, China ; Major Science and Technology Projects of Petro-China ; Marine Science and Technology Collaborative Innovation Center Project
DOI	10.1016/j.surfcoat.2024.130760
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51801234] ; National Natural Science Foundation of China[51771228] ; Natural Science Foundation of Shandong Province, China[ZR2023ME176] ; Major Science and Technology Projects of Petro-China[ZD2019-184-004] ; Marine Science and Technology Collaborative Innovation Center Project[22-05-CXZX-04-04-29]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Coatings & Films ; Physics, Applied
WOS记录号	WOS:001298796400001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：3[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/321006/189454
专题	中国科学院金属研究所
通讯作者	Han, Bin
作者单位	1.China Univ Petr East China, Sch Mat Sci & Engn, 66 Chang Jiang West Rd, Qingdao 266580, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qi,Si, Yueqi,Han, Bin,et al. Solidification evolution and corrosion performance of CoCrFeNiBx eutectic high entropy alloy coatings[J]. SURFACE & COATINGS TECHNOLOGY,2024,483:17.
APA	Zhang, Qi.,Si, Yueqi.,Han, Bin.,Li, Meiyan.,Wang, Qin.,...&Xue, Xixin.(2024).Solidification evolution and corrosion performance of CoCrFeNiBx eutectic high entropy alloy coatings.SURFACE & COATINGS TECHNOLOGY,483,17.
MLA	Zhang, Qi,et al."Solidification evolution and corrosion performance of CoCrFeNiBx eutectic high entropy alloy coatings".SURFACE & COATINGS TECHNOLOGY 483(2024):17.