高能球磨制备15%SiC/2009Al复合材料的微观组织与断裂行为

Microstructure and Fracture Behavior of 15%SiC/2009Al Composite by Ball Milling

利用高能球磨法制备了 15 %SiC/ 2 0 0 9Al复合材料。结果表明 ,基体合金内具有明显的位错胞与亚结构 ,平均晶粒尺寸约为 3～ 4μm。对复合材料挤压棒材分别在 2 5 ,15 0 ,2 0 0 ,3 15 ,40 0℃下测试了拉伸力学性能。复合材料在 15 0℃下还能保持较高的拉伸强度。断口形貌表明 ,在低温下孔洞首先在界面附近的基体合金内形成 。

aluminum alloy matrix composites reinforced by 15% of silicon carbide particulate were fabricated by ball milling. The microstructure of matrix provided with obvious dislocation cell and substructure was fine with 3～4 μm in grain size. The tensile properties of extrusion bar was respectively tested at 25, 150, 200, 315, 400 ℃. The results indi-cate that the strength of composite is high even at 150 ℃. The fractographs imply that voids initiate nucleation in the matrix near interfaces at lower temperature whereas generate in whole domain of matrix at higher temperature.