(四川大学 金属材料系，成都 610065)
摘 要: 运用挤压铸造工艺中不同的保压压强: 6MPa，30MPa，60MPa，110 MPa和156 MPa制备3种相同纤维体积分数的莫来石短纤维增强铝基复合材料，并测定其拉伸强度。不同基体的复合材料拉伸强度均随保压压强增高而提高。讨论了莫来石短纤维/ZL109复合材料残余空洞尺寸与保压压强的关系和残余空洞在T6处理过程中的长大现象及原因。结果表明，气孔类残余孔洞初始尺寸和最终尺寸与保压压强有关，并显著影响莫来石短纤维增强铝基复合材料的拉伸强度。
关键字: 莫来石纤维/ZL109复合材料；残余孔洞；抗拉强度
（Department of Metal Materials ,Sichuan University, Chengdu 610065）
Abstract:The mullite short-fibre reinforced Al matrix composites with the same volume fraction of fibre and different matrixes were fabricated by squeeze casting with different maintaining pressures for solidification, and the ultimate tensile strength (UTS) of the composites were tested. It is found that the UTS rose with the increase of the maintaining pressure for solidification. The relationship between the dimension of the air hole and the pressure for solidification has been discussed, and the factors resulting in growth of the air hole in a mullite/ZL109 composites in the process of the heat treatment have been analyzed. It is suggested that the pressure for solidification mostly affected the early and last dimension of the air holes, and the last dimension of the air hole played an important role for the UTS of the mullite short-fibre reinforced Al matrix composites.
Key words: Mullite/ZL109 composite; residual air hole; ultimate tensile strength
