(四川大學(xué) 金屬材料系，成都 610065)
摘 要: 運(yùn)用擠壓鑄造工藝中不同的保壓壓強(qiáng): 6MPa，30MPa，60MPa，110 MPa和156 MPa制備3種相同纖維體積分?jǐn)?shù)的莫來(lái)石短纖維增強(qiáng)鋁基復(fù)合材料，并測(cè)定其拉伸強(qiáng)度。不同基體的復(fù)合材料拉伸強(qiáng)度均隨保壓壓強(qiáng)增高而提高。討論了莫來(lái)石短纖維/ZL109復(fù)合材料殘余空洞尺寸與保壓壓強(qiáng)的關(guān)系和殘余空洞在T6處理過(guò)程中的長(zhǎng)大現(xiàn)象及原因。結(jié)果表明，氣孔類(lèi)殘余孔洞初始尺寸和最終尺寸與保壓壓強(qiáng)有關(guān)，并顯著影響莫來(lái)石短纖維增強(qiáng)鋁基復(fù)合材料的拉伸強(qiáng)度。
關(guān)鍵字: 莫來(lái)石纖維/ZL109復(fù)合材料；殘余孔洞；抗拉強(qiáng)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
