【摘要】 采用原位自生熔铸法制备了不同La₂O₃含量的钛基复合材料,研究了La₂O₃含量对钛基复合材料的显微组织、硬度及耐磨性的影响。结果表明:通过原位生成La₂O₃颗粒在钛合金基体中弥散分布,这些颗粒可以阻碍位错和晶界的运动,对复合材料有一定弥散强化作用;与未添加La₂O₃钛基复合材料相比,添加0.2vol.%La₂O₃后,（TiB+TiC）/IMI834钛基复合材料显微组织及性能达到最佳,洛氏硬度HRC从52.1增加到55.1,比磨损率从4.06×10^-7mm³/N·mm减少到3.05×10^-7mm³/N·mm,平均摩擦系数从0.30降低至0.24,磨损面仅存在较浅的犁沟,磨损机制为轻微的磨粒磨损。更多还原

【Abstract】 Titanium matrix composites with different amounts of La₂O₃ were prepared by using in-situ casting method. The effects of La₂O₃ content on the microstructure, hardness and wear resistance of（TiB+TiC）/IMI834 titanium matrix composites were studied. The results show that the in-situ produced La₂O₃ particles are dispersed in the matrix; which hinders the movements of dislocation and grain boundary, with a role in the strengthening of matrix; optimal microstructure and mechanical properties are obtained by adding 0.2 vol.%La₂O₃ into the titanium matrix composite. The Rockwell hardness increased from HRC 52.1 to HRC 55.1, the specific wear volume decreased from 4.06×10^-7mm³ to 3.05 x10^-7mm³, and the average friction coefficient decreased from 0.30 to 0.24. Only shallow furrows existed on the worn surface, and the wear mechanism was slight abrasive wear.更多还原