钛合金具有广阔的应用前景，为提高钛合金的成形质量和耐磨性能，采用激光选区熔化(Selective Laser Melting，SLM)技术制备TC4 合金，通过添加不同含量(0、0.10%、0.15%、0.20%、0.25%)的CeO2对TC4 合金进行改性。 使用XRD、SEM、电子万能试验机、摩擦磨损试验机和三维光学轮廓仪探究了CeO2含量对TC4 合金的显微组织、相组成、力学性能及摩擦磨损性能的影响。 结果表明:采用激光选区熔化技术制备添加适量CeO2的TC4 合金，相比TC4 合金原样，其组织得到细化，力学性能提升，摩擦系数和磨损量明显下降，黏着磨损和磨粒磨损的作用效果减弱。 当CeO2的含量为0.15%时，试样的硬度达到356.8 HV，屈服强度和抗拉强度分别达到1 027 MPa 和1 293 MPa，远超锻件水平，平均摩擦系数和磨损量达到最低值，分别为0.412 和3.729×10－2 mm3，其磨损机制为轻微的黏着磨损和磨粒磨损。
Titanium alloys have broad application prospects.In order to improve the forming quality and wear resistance of titanium alloys,selective laser melting (SLM) technology was used to prepare TC4 alloys,and the TC4 alloys were further modified by adding different contents(0, 0.10%, 0.15%, 0.20%, 0.25%) CeO2.Subsequently, XRD, SEM, electronic universal testing machine, friction and wear testing machine and three-dimensional optical profilometer were used to explore the effect of CeO2 content on the microstructure, phase composition,mechanical properties and friction and wear properties of TC4 alloy.Results showed that compared to the original TC4 alloy, the TC4 alloy obtained by selective laser melting technology with adding an appropriate amount of CeO2 possessed refined structure, strong mechanical propensities, low friction coefficient and wear amount and weak effects of adhesive wear and abrasive wear.When the CeO2 content was 0.15%,the hardness of the as-obtained sample reached 356.8 HV, the yield and tensile strengths reached 1 027 MPa and 1 293 MPa, far exceeding the level of forgings.Meanwhile, the average friction coefficient and wear amount reached the lowest values, which were 0.412 and 3.729×10－2 mm3, respectively, and the wear mechanisms were slight adhesive and abrasive wear.
