采用气压液态金属浸渗法制备了Al2O3(sf)/Al复合材料,通过X射线衍射仪、能谱仪、扫描电镜等研究手段对材料微观缺陷进行观察分析。研究表明,影响Al2O3(sf)/Al复合材料力学性能的主要因素有:在材料制备过程中,纤维不均匀分布造成的团聚;基体合金在加热过程中析出的Mg2Si相以及熔融金属液在浸渗预制体时所产生的显微缩孔及气孔。 Al2O3 (sf) / Al composites were prepared by pressure liquid metal infiltration method. The microscopic defects of the materials were observed and analyzed by means of X-ray diffraction, energy dispersive spectroscopy and scanning electron microscope. The results show that the main factors that affect the mechanical properties of Al2O3 (sf) / Al composites are the agglomeration caused by the uneven distribution of fibers during the preparation of the composites, the precipitation of Mg2Si phase and molten metal during the heating process Preformed body produced by the micro-shrinkage and pores.