铝硅基复合材料中硅相形貌研究

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。

Research on the Morphology of Silicon Phase in Al-Si Matrix Composites

The morphology of silicon phase in alumina/aluminum-silicon alloy composites is observed and studied on the metallographic microscope and the scanning electronic microscope.The results indicate that there is a coupled interface between alumina fiber and Si phase,and the fiber can serve as propitious sites for the heterogenous nucleation of Si phase.The primary Si in the composite can nucleate on the surface of the fiber and grow into spherical shapes.The fiber in the composite can trigger twin during the coupled growth of Al-Si eutectic and lead to the modification of the eutectic Si near the fiber.