中文摘要：

采用液相包裹法用Y2O3对Al2O3微粉表面进行改性，用挤压铸造法制备表面改性的Al2O3p／6061A1复合材料，研究改性对复合材料的显微组织和力学性能的影响．结果表明，用Y2O3表面改性后，Al2O3微粉在6061Al基体中的分布均匀性明显改善，复合材料的力学性能明显提高．与改性前比较，Al2O3体积分数为25％的复合材料，抗拉强度提高30％，屈服强度提高40％，弹性模量提高20％．其原因是，改性Al2O3微粉表面的Y2O3与Al基体间发生界面反应，使界面润湿性得以改善：界面相Y2Al与Al2O3和Al基体间均形成良好结合的界面。

英文摘要：

Liquid coated approach was used in Y2O3 modification on the surface of sub-micron Al2O3 particles, and a 6061 Al matrix composite reinforced by the modified Al2O3 particles was fabricated using squeeze-casting technique. The microstructure and tensile properties of the composites were investigated. The results show that the disperse homogenization of α-Al2O3 micro powders modified by Y2O3 is improved obviously in the 6061 aluminum liquid and tensile properties are increased obviously. In the composite with 25% volume fraction of Al2O3, the tensile strength increases by 30%, the yield strength increases by 40% and the elastic modulus increases by 20%. It can be suggested that the improvement of the interface wettability is due to the interfaces reaction between Y2O3 and Al matrix and the formation of good bonding interfaces of the Y2Al phase with Al2O3 particles and aluminum matrix.