Double aging treatment was carried out for ZL205A alloy test piece,and the influence of double aging on the microstructure and mechanical properties was explored.The results show that the double aging can improve the microstructure and the comprehensive mechanical properties of the test piece,especially the elongation.After multi-stage solution heat treatment of 500℃ × 30 min+535 ℃ × 60 min+540 ℃ × 720 min and aging of 150 ℃ × 540 min+210 ℃ × 300 min,the ZL205A alloy exhibits the highest tensile strength of 428.5 MPa,the highest hardness of 126 HBW,and the highest elongation of 9.3％.This heat treatment process can stabilize the microstructure of castings for different batches,obtain good comprehensive mechanical properties.
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