利用高分辩透射电子显微镜研究挤压铸造法制备的亚微米Al2O3颗粒增强Al基复合材料的界面微观结构.结果表明:Al基体的(200)和(111)面优先沿Al2O3颗粒表面生长,在复合材料界面处Al基体与Al2O3颗粒具有Al(200)//Al2O3(1012)、Al[011]//Al2O3[0221]的晶体学位向关系并形成半共格界面,且界面存在Al(111)//Al2O3(1120)的共格关系.界面干净无任何反应物.接近界面的Al基体中出现了柏氏矢量为b=1/3[111]弗兰克不全刃位错,该刃位错引起界面附近基体中明显的晶格应变场,位错周围晶格变形场的范围约为20～30层原子面宽度,而在Al2O3颗粒靠近界面的区域中未观察到位错等缺陷.并从晶体学角度对界面的形成机制进行了分析.
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