In this study, AlCoCrFeNiTi_0.5 high-entropy alloy (HEA) coating was deposited on Ti-6Al-4V alloy by laser cladding, aiming at enhancing the high-temperature wear and oxidation resistance. The microstructure, hardness, oxidation performance as well as high-temperature wear of the coating were characterized respectively. The results indicated that the coating was composed of dendrite (DR) and interdendrite (IR) phases. The DR phase had FCC structure being rich in Al, Co, Ni and Ti. The IR phases had BCC structure, for which, the IR1 was rich in Fe and Cr, and the IR2 was rich in Fe, Cr, Ti, Co and Ni. The coating possessed much better oxidation resistance than Ti-6Al-4V alloy at 600 °C due to a more compact oxide surface and the sluggish diffusion effect, which impeded the subsequent oxidation effectively. The average oxidation rate of the coating was about one tenth that of Ti-6Al-4V alloy. Moreover, the oxide scale was about one fifth that of Ti-6Al-4V alloy. The average micro-hardness of the coating was 706.3 HV about 2.32 times that of Ti-6Al-4V alloy. The HEA coating exhibited a mixture wear mechanism of adhesive and oxidative wear at 600 °C, having a wear volume loss about one thirteenth that of Ti-6Al-4V alloy.

在这项研究中，AlCoCrFeNiTi _0.5通过激光熔覆在Ti-6Al-4V合金上沉积高熵合金（HEA）涂层，以增强高温磨损和抗氧化性能。分别表征了涂层的组织，硬度，氧化性能和高温磨损。结果表明，涂​​层由枝晶（DR）和枝晶（IR）相组成。DR相具有富含Al，Co，Ni和Ti的FCC结构。IR相具有BCC结构，为此，IR1富含Fe和Cr，IR2富含Fe，Cr，Ti，Co和Ni。该涂层在600°C时具有比Ti-6Al-4V合金更好的抗氧化性，这归因于氧化物表面更致密且扩散效果缓慢，从而有效地阻碍了后续的氧化。涂层的平均氧化速率约为Ti-6Al-4V合金的十分之一。此外，氧化皮约为Ti-6Al-4V合金的氧化皮的五分之一。涂层的平均显微硬度为706.3 HV，约为Ti-6Al-4V合金的2.32倍。HEA涂层在600°C时表现出粘合剂和氧化磨损的混合磨损机理，其磨损量损失约为Ti-6Al-4V合金的十三分之一。