中文摘要：

选用0．15μm和5μm的Al2O3颗粒，采用挤压铸造法制备了体积分数为40％的铝基复合材料。利用选区电子衍射和高分辨电子显微技术研究了Al2O3P／1070Al界面附近基体的显微组织。结果表明，复合材料增强体颗粒为5μm时，基体存在大量的Eh热错配应力引发的位错，颗粒粒径为0．15μm时，基体表现为近无位错的组织特征，其缺陷形式为1～5nm的“微畸变区”，这主要是由于粒径小、分布弥散，微区应力均匀所致。

英文摘要：

Aluminum based composites in a volume fractions of 40% were fabricated using the Al2O3 particles of 0.15μm and 5μm in sizes by extrusion casting technique. The microstructure characterization near the interfaces of Al2O3p/1070Al composites was investigated by SADP and HREM techniques. Results show that dislocations of high-density were generated in the Al2O3p/Al composite reinforced with Al2O3 particles of 5μm due to the thermal mismatch stress. In contrast, free dislocations and some “micro distortion areas”of 1-5 nm were observed in the Al2O3p/Al composite reinforced with A1203 particles of 0.15 ~tm due to the dispersion of fine sub-micron particles and the uniform stress distribution near the interfaces.