稀土元素Ce对Cu-Al2O3复合材料组织及性能的影响

采用机械合金化与放电等离子烧结的方法制备了不同质量分数的Cu-Al₂O₃-Ce复合材料，研究了稀土元素Ce对Cu-Al₂O₃复合材料显微组织形貌及硬度、抗拉强度、导电率、摩擦磨损等物理性能的影响。结果表明:Cu-Al₂O₃-Ce复合材料中的陶瓷颗粒更加均匀弥散的分布在基体中；加入稀土元素Ce后的Cu-Al₂O₃-Ce复合材料硬度为HV 108.2、拉伸强度为301 MPa、断面伸长率为19.6%、导电率为54.51 MS·m-1，与Cu-Al₂O₃相比有明显提升；Cu-Al₂O₃的磨损机理主要为磨粒磨损，Cu-Al₂O₃-Ce主要为黏着磨损，当摩擦速率较大时，Cu-Al₂O₃-Ce的摩擦系数和体积磨损率更小，耐磨性能优于Cu-Al₂O₃。

Effect of rare earth Ce on the microstructure and properties of Cu-Al2O3 composites

The Cu-Al₂O₃-Ce composites doped with rare earth Ce in different mass fractions were fabricated by mechanical alloying and spark plasma sintering. The effect of Ce content on the microstructure and physical properties of Cu-Al₂O₃ composites were studied. The results show that, the ceramic particles are uniformly dispersed in Cu-Al₂O₃-Ce composites. Compared with Cu-Al₂O₃ composites, the Cu-Al₂O₃-Ce composites performances are significantly improved, having the hardness of HV 108.2, the tensile strength of 301 MPa, the elongation of 19.6%, and the conductivity of 54.51 MS·m-1. The wear mechanism of Cu-Al₂O₃ and Cu-Al₂O₃-Ce is abrasive wear and adhesive wear, respectively. Compared with Cu-Al₂O₃ composites, Cu-Al₂O₃-Ce composites have the smaller friction coefficient and volume abrasion rate at high friction rate. Thus, the wear resistance of Cu-Al₂O₃-Ce composites is highly improved by doped with rare earth Ce.