METALS AND METAL MATRIX COMPOSITES |
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Effect of Annealing on Microstructure and Corrosion Resistance of the CoxCrFeMnNi2-x High-entropy Alloys |
WANG Quan1, WU Changjun1,2, XU Xuewei1, PENG Haoping1, LIU Ya1, SU Xuping1,2
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1 Jiangsu Key Laboratory of Material Surface Science and Technology, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China 2 Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China |
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Abstract Aseries of fcc-type CoxCrFeMnNi2-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 Co1.5CrFeMnNi0.5 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 CoxCrFeMnNi2-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 CoxCrFeMnNi2-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.
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Published:
Online: 2022-06-09
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Fund:National Natural Science Foundation of China (51771035, 51971039). |
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