The influence of heat treatment process on the microstructure and mechanical properties of ZL205A aluminum alloy was studied in this paper.The results show that the grain size of the as-cast alloy is about 100～200 μm,there is an obvious Cu-rich segregation at the grain boundary,and there are Ti-rich impurity phases in the crystal.At 540℃solution treatment,the grain boundary segregation began to redissolve,and the best solution effect was achieved when the heat was held for 10～14 h.After aging treatment at 175℃for 1～3 h,the θ phase which is semi-coherent with matrix is formed,and the alloy has good comprehensive mechanical properties.
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