High temperature oxidation behaviour of non-equimolar AlCoCrFeNi high entropy alloys

Oxidation properties of AlCoCrFeNi high entropy alloys, i.e. 5%Al–35%Co–25%Cr–15%Fe–20%Ni (Al5Co35Cr25Fe15Ni20) and 5%Al–25%Co–20%Cr–15%Fe–35%Ni (Al5Co25Cr20Fe15Ni35), were investigated in air atmosphere at 1273 K. Thermogravimetry (TG) investigations determined that, under these conditions, the samples demonstrate scale growth according to the parabolic rate law with rate constants the order of 10−11 g2cm−4s−1. Combined scanning electron...