Effect of Ti content on wear and high-temperature oxidation resistances of laser-clad CoCrMoNbTix high-entropy alloy coatings

To improve the surface wear and high-temperature oxidation resistances of the TC4 titanium alloy, the CoCrMoNbTix high-entropy alloy (HEAs) coatings were prepared on the TC4 surface by laser cladding. The microstructure was mainly composed of the BCC phase and intermetallics. With the increase of Ti content, the microhardness and wear resistances were effectively improved. After oxidation at a constant temperature of 800 °C for 100 h, the oxidation weight gain of the Ti1.0 was only 27.73 % of the substrate.