Abstract
The oxidation behavior of L12-strengthened Al0.3FeCrCuNi2 high-entropy alloy (HEA) with various initial grain sizes was investigated by isothermal oxidation at 900 °C in air. The results show that the starting grain size has a significant effect on the oxidation kinetic process. Reducing the grain size promotes the direct formation of more protective Al-rich oxide layer in the regions near the grain boundaries (GBs), and allows the development of a denser inner Al2O3 layer in the intragranular regions, thereby improving the oxidation resistance. This effect is mainly attributed to more significant surface Cu segregation near GBs due to grain refinement.
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