Abstract
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.
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