对搅拌铸造法制备的ＳｉＣｐ增强铝基复合材料铸件产生缺陷的形貌及形成机理进行了分析研究．结果表明，ＳｉＣｐ在Ａｌ液中物理、化学上处于不稳定状态———ＳｉＣｐ和Ａｌ液不浸润，不能作为α－Ａｌ的形核核心；以及ＳｉＣｐ和Ａｌ液能够产生自发反应，是造成该复合材料出现气孔、夹杂、团聚、集聚、偏析和界面杂质等缺陷的主要原因．而搅拌复合和铸造工艺参数不当，则是造成上述缺陷的重要原因． The morphology and formation mechanism of defects in SiCp reinforced aluminum matrix composite castings prepared by stirring casting method were analyzed. The results show that SiCp is physically and chemically unstable in Al liquid - SiCp and Al liquid are not infiltrated and can not be used as the nucleus of α-Al nucleation. And SiCp and Al liquid can spontaneously generate spontaneous reaction, Materials appear pores, inclusions, agglomeration, agglomeration, segregation and interface impurities and other defects of the main reasons. The mixing compounding and casting process parameters are improper, it is an important reason for the above defects.