Abstract: Al_0.5Co_0.5NiCrFe high-entropy alloy coatings with different carbon contents were prepared by argon arc cladding, and effect of carbon content on the microstructure and properties of the Al_0.5Co_0.5NiCrFe high-entropy alloy coating was studied. The results show that after the addition of carbon, the high-entropy alloys are all composed of a single FCC structure, and no other structure are characterized. However, according to the microstructure and energy spectrum analysis of the high-entropy alloy, it can be found that there is carbon and chromium between the dendrites of the high-entropy alloy. The microstructure of the high-entropy alloy coating is a typical dendritic structure, and the microstructure is continuously refined with the increase of carbon content. With the increase of carbon content, the hardness of high-entropy alloy coating increases continuously. When the carbon content is 4%, the highest hardness is 383.2 HV0.5, and the wear resistance is also the best. With the continuous increase of carbon content, the corrosion resistance of high-entropy alloy first increases and then weakens, and when the carbon content is 2%, corrosion resistance is the best. According to the oxidation mass gain per unit area, the oxidation resistance of the high-entropy alloy first increases and then decreases. When the carbon content is 2%, the coating has the best oxidation resistance.

Key words: high-entropy alloy coating, wear resistance, corrosion resistance, oxidation resistance