Influence of temperature on tribological behavior of AlCoCrFeNi coatings prepared by electrospark deposition

AlCoCrFeNi high entropy alloy coatings were prepared on CrNi3MoVA steel by electrospark deposition technology, and their tribological behavior at different temperatures was investigated by utilizing a reciprocating friction and wear tester, and SEM, EDS and XRD were used to analyze the morphologies, composition and phase structure of AlCoCrFeNi coating. The results show that the as-deposited coating is composed of a single BCC structure with a hardness of 540±40 HV0.1. The wear resistance of AlCoCrFeNi coating at 600 ℃ is the bestamong 300 ℃, 600 ℃and 800 ℃, and its wear rate is only 2.53×10-5 mm3 /(N·m), which is one order of magnitude lower than that at the other two temperatures. At 600 ℃, the main wear mechanism is oxidation wear, and a continuous compact oxide scale formed on the worn surface, which greatly improves the wear resistance of AlCoCrFeNi coating.