摘要:
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 (101 2) 、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。
Abstract:
The microst ructures at the interfaces of the aluminum matrix composite reinforced by Al2O3 particles
were characterized by means of high resolution t ransmission elect ron microscopy (HRTEM). It was revealed that Al(200) and Al (111) planes of the Al matrix should first grow along the surfaces of the Al2O3 particles, such orien2tation relationship as Al (200) ∥ Al2O3(101 2) and Al [ 011 ] ∥ Al2O3 [ 0221 ], and partial-coherent interface exist in one of the interfaces between the Al matrix and the Al2O3 particles, a coherent relationship with Al(111) ∥ Al2O3 (1120) appears in another interface, but no resultant production is found along those interfaces. Frank partial edge dislocation with 1/ 3 [111 ] Burgers vector, which is responsible for forming of remarkable lat tice deformation field with the scale about 20～30 atomic planes, is observed within the Al mat rix near the interface, however, no dislocations and other defect s are found within the area of the Al2O3 particles near the interfaces. At the same time, the mechanism for forming the interface features is analyzed from the viewpoint of crystallography.
百度学术
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