在金相显微镜和扫描电子显微镜上观察和研究了氧化铝／铝硅合金复合材料中的硅相形貌。结果表明氧化铝纤维与硅相之间存在共格界面，可作为硅相非自发形核的衬底；复合材料中的初生硅可在纤维表面形核生长为颗粒状；复合材料中的纤维在铝硅共晶体的共生生长过程中，可触发孪晶，导致纤维附近的共晶硅呈变质形态。 The morphology of the silicon phase in the alumina / aluminum-silicon alloy composite was observed and studied on a metallographic microscope and a scanning electron microscope. The results show that there is a coherent interface between the alumina fiber and the silicon phase, which can be used as a substrate for the non-spontaneous nucleation of the silicon phase. The primary silicon in the composite material can nucleate and grow into a granular form on the fiber surface. Al-Si eutectic symbiosis growth process, can trigger twins, resulting in eutectic silicon fiber near the metamorphic morphology.