以Ni80Cr20-Al-Si复合合金粉末为原料，在Ti6Al4V合金表面激光熔覆制备新型金属间化合物耐磨复合涂层。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)表征了涂层的组织结构、硬度和摩擦学性能并分析了其相关机理。结果表明，涂层由硬质相Ti5Si3/Al3Ni2和基体Al3Ti/NiTi组成，与Ti6Al4V基体为良好的冶金结合，涂层的平均硬度约为Ti6Al4V合金(350 HV0.5)的2.5至3.0倍。其中涂层N2(质量分数为Ni80Cr20-40%Al-20%Si)具有较好的耐磨性，约为钛合金的2倍，而涂层N1(质量分数为Ni80Cr20-40%Al-10%Si)中的Al3Ni2脆性颗粒增多，基体含量随之减少，涂层的耐磨性能下降。Ti6Al4V合金的室温磨损机理为严重的粘着磨损和磨粒磨损，复合涂层的室温磨损机理为脆性断裂和粘着磨损。

The composite powders of Ni80Cr20-Al-Si were prepared on Ti6Al4V alloy substrate by laser cladding. The microstructure, micro-hardness and tribological properties of the different constituent of composite coatings were investigated using X-ray diffraction(XRD), scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS), moreover, the wear mechanism of the Ti6Al4V alloy specimen and laser clad coatings were analyzed. The results shown that the laser clad coating shave metallurgical bonding withTi6Al4V substrate. Due to in situ formation of high hardness of Ti5Si3/Al3Ni2 reinforcing phase, the average hardness of laser clad coating is approximately 2.5 to 3 times that of Ti6Al4V alloy(350 HV0.5). The mass fraction of coating N2(Ni80Cr20-40Al-20Si, wt%)possess better wear resistance is approximately twice than Ti6Al4V alloy. However, the mass fraction of coatingN1(Ni80Cr20-40Al-10Si, wt%)exhibits poorer wear resistance that of Ti6Al4V alloy due to a large number of volume fractionAl3Ni2.Thewear mechanism of Ti6Al4V alloy is severe adhesive wear and abrasive wear. While the laser clad coating is mainly brittle fracture and adhesive wear.