利用挤压铸造制备Ａｌ_２Ｏ_３／ＺＬ１０８复合材料，研究了氧化铝纤维／铝合金基体的界面．结果表明，在复合材料中，纤维与基体之间存在界面层，合金元素通过适当的化学反应可形成尖晶石，有利于纤维与基体的结合．试样断口分析还表明，复合材料的界面结合状况良好，可传递足够的载荷到纤维上，发挥其增强作用． Al_2O_3 / ZL108 composites were prepared by extrusion casting, and the interface of alumina fiber / aluminum alloy substrate was studied. The results show that there is an interface layer between the fiber and the matrix in the composite material, and alloying elements can form spinel through proper chemical reaction, which is in favor of the combination of the fiber and the matrix. Fracture analysis of the specimen also showed that the interfacial bonding of the composite material is in good condition and sufficient load can be transmitted to the fibers to exert their reinforcing effect.