Abstract
Oxidation properties of (FeCoNi)100-xAlx (x = 0, 5, 10, 15, and 20) high entropy alloys were investigated in air atmosphere at 800 °C. Combined scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS) sur-face analysis and X-ray diffraction (XRD) studies revealed that the addition of Al transformed the alloy from a single FCC solid solution structure to a mixed structure of FCC and BCC, from an unevenly distributed rod-like structure to a uniformly distributed dendritic structure. With the increase of Al content, the oxidation scale mainly consists of Al2O3 and Co2O3 and the oxidation kinetic curve of (FeCoNi)80Al20 HEA reaches the minimum value, which clarifies the superior high temperature resistance.
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