激光熔化沉积Ti5Si3/NiTi双相金属间化合物合金耐磨性能

Wear Resistance of Ti5Si3/NiTi Biphase Intermetallic Compound Alloy by Laser Melting Deposition

摘要:

采用激光熔化沉积工艺制备出以块状Ti5Si3过渡金属硅化物为初生相、以Ti5Si3/NiTi共晶为基体的双相金属间化合物耐磨合金，在室温干滑动磨损条件下测试了Ti5Si3/NiTi合金的耐磨性能并讨论了其磨损机制。结果表明，由于Ti5Si3/NiTi合金良好的强韧性配合以及在磨损过程中磨损表面上形成了“无组织特征”的表面高硬度层，对合金有保护作用，合金在室温干滑动磨损条件下具有优异的耐磨性能和很低的载荷敏感性

Abstract:

Biphase intermetallic compound wear-resistant alloy was prepared by laser melting deposition technique with bulk silicide Ti-5Si3 as primary phase and with Ti5Si3/NiTi eutectic as substrate. The wear resistance of Ti5Si3/NiTi alloy was tested under dry sliding wearing condition at room temperature and the worn mechanism was discussed. Results show that the Ti5Si3/NiTi alloy has excellent wear resistance and extremely low load-sensitivity under dry sliding wearing conditions, which is attributed to the good match between the toughness and the strength as well as the protection for the alloy from the formation of microstructurally featureless layer with high hardness on the worn surface of the alloy