用挤压铸造方法制备了Mullite/Al Cu复合材料。用硬度测试仪、差示扫描量热仪 (DSC)和透射电镜(TEM)等设备研究了铝基复合材料及其基体合金中Cu含量变化对时效硬化行为的影响 ,同时还研究了增强纤维对时效相的析出序列、析出相和位错结构的影响。结果表明 ,无论是在复合材料中还是在基体合金中 ,随着Al Cu合金中Cu含量的增加 ,时效硬化过程均有不同程度的加速 ;Mullite纤维的引入提高了Al Cu合金的时效硬度 ,明显加速了Al Cu合金的时效硬化过程 ,对GP区的形成有抑制作用 ,但不影响基体沉淀相的析出顺序 Mullite / Al Cu composites were prepared by extrusion casting. The influence of Cu content on the aging hardening behavior of aluminum matrix composites and their matrix alloys was investigated by means of hardness tester, differential scanning calorimeter (DSC) and transmission electron microscope (TEM). At the same time, Precipitation of the aging facies, the effects of precipitated phases and dislocation structures. The results show that the age hardening process accelerates with the increase of Cu content in Al Cu alloy both in the composite and in the matrix alloy. The introduction of Mullite fibers increases the aging hardness of Al Cu alloy obviously Accelerated the age hardening process of Al Cu alloy, which inhibited the formation of GP zone but did not affect the precipitation order of matrix precipitates