Abstract
To develop inexpensive high-strength high entropy alloy (HEA) coatings, microstructure, hardness and wear behavior of AlxCoCrFe2Ni (with x = 0.3, 0.7, 1.0) high-entropy alloy coatings prepared by laser cladding were investigated in this work. It was found that the phase composition and microstructure of coatings with high Fe content could be tailored by adjusting Al content. Addition of Al could cause the phase to evolve from FCC to a mixture of FCC, ordered BCC (B2) and disordered BCC (A2) and finally to a mixture of A2 and B2. The hardness increased with the change of phase composition, resulting in a higher hardness (621HV) and better wear resistance at x = 1.0. The microstructure of AlCoCrFe2Ni coating consisted of spherical nano-scale B2 particles and A2 matrix. The strengthening effects of A2/B2 morphology were estimated and strengthening of order was the most important strengthening factor. In addition, the main wear mechanism was abrasive wear with decreasing fraction of oxidation wear as Al content increased.
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The authors acknowledge financial support by the National Key Research and Development Program of China (No. 2019YFA0705300) and from City University of Hong Kong under Grant Nos. 9380088 and 7005078.
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Zhang, G.J., Tian, Q.W., Yin, K.X. et al. Microstructure, Hardness and Wear Behavior of AlxCoCrFe2Ni (x = 0.3, 0.7, 1.0) High Entropy Alloy Coatings Prepared by Laser Cladding. JOM 73, 3597–3605 (2021). https://doi.org/10.1007/s11837-021-04874-w
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DOI: https://doi.org/10.1007/s11837-021-04874-w