Enhancing oxidation resistance with Si in Fe36Ni36Al15Cr10Si2Mo1 multi-principal element alloy at 700 °C

The eutectic high entropy alloys with large amounts of Al and Cr have exhibited superior oxidation resistance. Here, we confirmed that Si could further enhance the oxidation resistance by forming a continuous oxidation layer in Fe 36 Ni 36 Al 15 Cr 10 Si 2 Mo 1 alloy. Si promoted the outward diffusion and transformation of Al which effectively enhanced the oxidation resistance. The FeCr 2 O 4 spinel and silicate formed by the solid-state reaction also contributed to the oxidation resistance. The thermodynamic and kinetic factors were then discussed to understand the inherent oxidation mechanism of the dual-phase Fe 36 Ni 36 Al 15 Cr 10 Si 2 Mo 1 alloy, which provide new insights into the dual-phase alloy design and oxidation resistance.