Abstract:Ni and Co elements, vital components in numerous high-entropy alloy (HEA) series, significantly influence the performance of FeCrAlCu series HEAs. In this study, FeCrAlCu, FeCrAlCuNi, FeCrAlCuCo, and FeCrAlCuNiCo HEA coatings were synthesized on the surface of 45# steel through cold spraying-assisted laser remelting. The results revealed that all four HEA coatings comprised face-centered cubic and body-centered cubic phases. Additionally, the microstructure of the coatings consisted of columnar dendrites. The addition of both Ni and Co refined the columnar dendritic grains in the coating. Moreover, the FeCrAlCuNiCo HEA coating exhibited excellent friction performance, with a hardness of 596.7 HV, a friction factor of 0.45, and a wear rate of 3.72 × 10?5mm3.N?1.m?1. The predominant wear modes of the coating were adhesive wear and abrasive wear. With the addition of Ni and Co elements, the elements of FeCrAlCu series HEA coating are evenly distributed in the dendrites and interdendrite structures.