激光熔炼Ti5Si3-TiCo-Ti2Co多相金属间化合物合金的组织与耐磨性

利用激光熔炼技术制备出Ti5Si3-TiCo-Ti2Co多相金属间化合物新型耐磨合金，分析了合金的显微组织并测试了合金的室温干滑动磨损性能。结果表明，Ti5Si3-TiCo—Ti2Co多相金属间化合物耐磨合金组织均匀、致密，在室温干滑动磨损条件下具有优异的耐磨性能。Ti5Si3-TiCo—Ti2Co多相金属间化合物耐磨合金的磨损量随磨损时间的延长缓慢增加，磨损率先增加后降低；难熔金属硅化物Ti5Si3的高硬度及金属间化合物的反常屈服强度一温度关系及磨损过程中表面粘附转移保护层的形成，是Ti5Si3-TiCo—Ti2Co多相金属间化合物耐磨合金在室温干滑动磨损试验条件下具有较好耐磨性能的原因。

Microstructure and Wear Resistance of Laser Melted Ti5Si3-TiCo-Ti2Co Multiphase Intermetallic Alloys

Ti5Si3-TiCo-Ti2Co multiphase intermetallic alloy with wear resistant has been fabricated by laser melt deposition process. The microstructure of intermetallic alloys is characterized by OM, SEM, XRD and EDS and the wear properties are evaluated in the room-temperature dry sliding wear conditions and the wear mechanism is discussed. It is found that the Ti5Si3-TiCo-Ti2Co multiphase intermetallic alloy has an excellent wear resistance under room-temperature dry sliding wear conditions. The wear mass loss increases very slowly, and the wear mass loss rate increases first then decreases with wear time increasing due to the high hardness of Ti5Si3, and the abnormal yield strength of intermetallics with temperature and the formation of smearing-layer on the worn surface.