Y-Hf co-doped AlCoCrFeNi2.1 eutectic high-entropy alloy with excellent oxidation and spallation resistance under thermal cycling conditions at 1100 °C and 1200 °C

The oxidation behavior of AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) with Y-Hf co-doping under thermal cycling conditions at 1100 degrees C and 1200 degrees C is studied in comparison to the conventional NiCoCrAlYHf alloy (CNA). The oxidation rates of EHEA at two temperatures are much lower than those of CNA. Additionally, the resistance to Al2O3 scale spallation for the EHEA is much superior to that for the CNA. It is well demonstrated that increasing the interfacial toughness is more beneficial to improve the scale spallation resistance in comparison to the decrease in oxidation rate.

Automated summary

The oxidation rates of AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) with Y-Hf co-doping are much lower than those of conventional NiCoCrAlYHf alloy (CNA) at 1100 degrees C and 1200 degrees C. Additionally, EHEA shows superior resistance to Al2O3 scale spallation compared to CNA, indicating that increasing interfacial toughness is more beneficial for improving scale spallation resistance than reducing oxidation rate.