采用液态搅拌法制备了反应自生 Al2 O3增强金属基复合材料并研究了它的机械性能 .采用 X衍射和扫描电镜分析了相组成和断口形貌 .与基体合金比较 ,复合材料的强硬性得到较大提高 ,其中 10 % Cu O复合材料的抗拉强度提高了 5 2 .3% ,硬度提高近一倍 .复合材料中的拉伸断裂特征为韧性断裂 ,铸造缺陷渣气孔是主要的裂纹源 The self-generating Al 2 O 3 reinforced metal matrix composites were prepared by liquid mixing method and its mechanical properties were investigated. The phase composition and fracture morphology were analyzed by X-ray diffraction and scanning electron microscopy. The hardenability of the composites was better than that of the matrix alloy The tensile strength of 10% CuO composites increased by 52.3% and the hardness nearly doubled.The tensile fracture in the composites was characterized by ductile fracture, and the casting slag hole was the main source of cracks