退火处理对CoxCrFeMnNi2-x高熵合金显微组织和耐蚀性的影响

doi:10.11896/cldb.21110150

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Abstract Aseries of fcc-type Co_xCrFeMnNi_2-x (x=0.25—1.5) high-entropy alloys were prepared by arc melting method and were vacuum annealed at 600—1 000 ℃ for 120—360 h in this work. The influence of Co and Ni contents, annealing temperature and annealing time on microstructure and corrosion resistance of these alloys were investigated. The results show that all the investigated as-cast alloys are composed of single fcc phase. Except for Co_1.5CrFeMnNi_0.5 alloy, in which a small amount of hcp phase is formed, there is no phase transformation or precipitation in other alloys after 600—1 000 ℃ annealing. The as-cast Co_xCrFeMnNi_2-x alloys are mainly composed of coarse dendrites. Their corrosion resis-tance gradually decreases with the increase of Co content. Experimental results indicate that the metallographic microstructure of the Co_xCrFeMnNi_2-x alloys significantly change after annealing. The dendritic structure of these alloys becomes much finer after 600 ℃ annealing, because the trunks of the dendrites are truncated by grain boundary migration. The corrosion resistance of the alloys are significantly reduced due to the increase of coarse grain boundary. After annealing at 800 ℃ for 120 h, tortuous equiaxed grain boundaries are formed with corrosion resistance greatly improved, while the woven net-like subcrystals still exist in the equiaxed grains. Moreover, further prolonging annealing time or increasing annealing temperature can smoothen and refine the grain boundaries. The woven network sub-crystals in the crystal gradually disappear, and the corrosion resistance of the alloys is further improved. These results will provide a basis for designing and microstructure controlling of the fcc-type high-entropy alloys.

Key words： annealing treatment high entropy alloy microstructure dendrite corrosion resistance

Published: Online: 2022-06-09

CLC number:

TG113.12

Fund:National Natural Science Foundation of China (51771035, 51971039).

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	WANG Quan
	WU Changjun
	XU Xuewei
	PENG Haoping
	LIU Ya
	SU Xuping

Cite this article:

WANG Quan,WU Changjun,XU Xuewei, et al. Effect of Annealing on Microstructure and Corrosion Resistance of the Co_xCrFeMnNi_2-x High-entropy Alloys[J]. Materials Reports, 2022, 36(11): 21110150-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21110150 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21110150

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