LAUSR

The CuZrAlTiNiSi high entropy alloy coating (HEAC) was synthesized on T10 substrate using mechanical alloying and vacuum hot-pressing sintering technique. The results show that the final product of as-milled powders is amorphous HEA phase with homogeneous component distribution. The sintered coating is composed of solid solutions and intermetallic compounds. No pores and defects appear in the HEAC surface, suggesting a good consolidation quality. In addition, the HEAC possesses a good interface bonding, mainly owing to the diffusion of Al atoms from coating to substrate. The average microhardness of the coating reaches 927 HV 0.2 , and is more than 3 times higher than the substrate (281 HV 0.2 ). The high microhardness can be mainly explained by the second phase strengthening effect and solid-solution strengthening. Furthermore, compared with the substrate, the HEAC exhibits excellent wear resistance with lower friction coefficient, reduction of the wear groove depths and widths, fewer wear volumes, and minimum specific wear rate under the same conditions. Moreover, based on the wider passive region and uniform surface corrosion morphology, the HEAC presents a good pitting resistance in seawater solution.