Effect of Carbon Addition on the Corrosion Properties of FeCoCrMnNi High Entropy Alloy

Alloying is a technique that has long been used to provide desirable properties in materials. It mainly involves the addition of relatively small amounts of secondary elements to a primary element. Recently, a new alloying strategy that involves the combination of multiple principal elements in high concentrations to create new materials called high-entropy alloys has been investigated by several researchers. In this paper, the thermodynamic calculations and phase formation rules for the formation of FeCoCrMnNi high entropy alloy are discussed. The FeCoCrMnNi and FeCoCrMnNiC 0.2, high entropy alloys were cast using a vacuum arc melting furnace. It was shown that both of the high entropy alloys formed a single FCC solid solution phase without any other impurities or phases. The whole pattern Rietveld refinement analysis showed that the addition of carbon to the FeCoCrMnNi high entropy alloy decreased the crystallite size. Moreover, the Tafel corrosion test results indicated that the corrosion resistance of the FeCoCrMnNi high entropy alloy increased 185 times with the addition of carbon.