Effect of Al Content on Erosion Wear Resistance and Corrosion Resistance of CoCrFeNiTi0.5 High-entropy Alloy Coatings
ZHAO Jianhua1, JIN Ronghua2,*, JI Xiulin3, DUAN Tianze1, ZHUANG Shudong1, ZHAO Zhanxi1
1 College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, Jiangsu, China 2 China Special Equipment Inspection & Research Institute, Beijing 100013, China 3 College of Engineering, Shantou University, Shantou 515063, Guangdong,China
Abstract: AlxCoCrFeNiTi0.5 (x—molar ratio, x=1.0, 1.5, 2.0, 2.5, denoted as Alx) high-entropy alloy (HEA) coatings were fabricated by laser cladding. The effect of Al content on microstructure, microhardness, erosion wear resistance and corrosion resistance of CoCrFeNiTi0.5 HEA coatings was studied. The results show the phases of AlxCoCrFeNiTi0.5 HEA coatings evolve gradually from simple FCC+BCC mixed disordered solid solution to mixed structure of disordered BCC+ordered BCC. The hardness of the coatings increases significantly with the increase of Al content. Al1.0 HEA coating follows ductile erosion mode. Al1.0 HEA coating has good erosion resistance at different impact angles. The erosion wear rate of Al1.0 HEA coating is only 56.09%, 59.33% and 60% that of 06Cr16Ni5Mo stainless steel at low impact angle (30°), middle impact angle (60°) and high impact angle (90°), respectively. The corrosion resistance of AlxCoCrFeNiTi0.5 HEA coatings gradually reduces with the increase of Al content. Proper Al addition can not only improve erosion wear resistance of CoCrFeNiTi0.5 HEA coating, and the alloy also has good corrosion resistance.
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