中文摘要：

采用透射电子显微镜对挤压铸造法制备的Al2O3／2024Al复合材料的界面微观结构进行了深入研究。结果表明：复合材料界面结合紧密且无任何反应物。Al基体的（111）面与A12O3颗粒表面保持共格和半共格关系：Al（111）／／Al2O3（1121）、Al（111）／／Al2O3（2111）、Al（111）／／Al2O3（1120），界面处基体中可以看到由于晶格错配而产生的刃位错，说明基体与增强颗粒晶面间距接近时，基体可以依靠增强颗粒表面结晶并长大，即增强颗粒作为基体异质形核的质点，并从晶体学角度对界面的形成原因进行了解释。

英文摘要：

The microstructures at the interfaces of Al2O3/2024Al composite manufactured by extrusion casting were investigated by transmission electron microscopy （TEM）. The results indicate that no resultant production is found along the interfaces, and several coherent or semi-coherent interface relationship, such as Al（111）//A1203 （1121） , Al（111）//Al2O3（ 2111 ）, Al（111）//Al2O3（ 1120 ）, are characterized along the explored interfaces of the composite. An edge dislocation is also found along one of the interfaces. It could be deduced that the AI matrix could nucleate and grow basing the nearby strengthening particle only when there is no obvious difference between value of the interplanar spacing of the matrix and the strengthening particle, and the strengthening particles can act as sites for heterogeneous nucleation of AI matrix. At same time, the reason for forming such interface features was analyzed from the viewpoint of crystallography.