Abstract: High-entropy alloy(HEA) has some excellent properties which are difficult to achieve by traditional alloys because of its characteristics of multi-principal element and high mixing entropy, and has great application prospects in the field of surface technology. In this paper, FeCrNiCuAlSn0.5 HEA coating was prepared on the surface of 45 steel based on the thermite reaction/spray deposition HEA cladding coating technology. XRD, SEM and EDS were used to analyze the phase structure, microstructure and element distribution of the FeCrNiCuAlSn0.5 HEA coa-ting, and the hardness, bonding strength, friction and wear properties of the coating were determined using Vickers hardness tester, top breaking test machine and ball disc friction meter. The results showed that the spray coating was mainly composed of FCC phase and BCC phase, and may contained a small amount of Ni3Sn2. The microstructure of coating was dendrite, the secondary dendrite arm spacing was about (5.25±2.75) μm, and the average cooling rate reached 2.37×104 K/s. No defects such as pores and inclusions appeared at the interface between the coating and the substrate, and a good metallurgical bond was achieved. The average bonding strength of the coating and substrate was (412.8±16) MPa. The average microhardness of the coating was (539±10)HV, the friction coefficient and the wear rate was 0.50, (7.24±0.52)×10-6 mm3/(N·m), respectively, while the friction coefficient and wear rate of the 45 steel substrate was 0.75, (1.45±0.35)×10-5 mm3/(N·m), respectively, showing more excellent wear resistance than the substrate.
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