Influence of Y2O3/CeO2 on the microstructure and properties of AlCrFeNiCu high-entropy alloy coating

• Addition of Y2O3 or CeO2 to AlCrFeNiCu high-entropy alloy coating refined the grain structure and modified solidification kinetics, significantly enhancing overall performance. • Doped coatings achieved hardness of 8.61 GPa (Y2O3) and 8.72 GPa (CeO2), with wear rate reductions of 41.3% and 38.0% respectively compared to the undoped coating. • Both modified coatings showed an order-of-magnitude decrease in self-corrosion current density in 0.1 mol/L KOH solution, indicating superior corrosion resistance. • Oxide-doped coatings maintained structural integrity after 90 min at 1200°C, while the undoped coating developed microcracks after only 30 min, demonstrating markedly improved high-temperature oxidation resistance.