Pre-aging,single-stage aging and double-stage aging treatments were carried out on ADC 12 aluminum alloy,and the effects of different artificial aging treatments on the precipitated phases and mechanical properties of ADC 12 alloy were investigated by means of microstructure characterization,EDS analysis and hardness,tensile and impact tests.The results show that different aging treatments lead to differences in the microstructure morphology and phase composition of the alloy.After pre-aging,dispersed precipitated phases are formed in the microstructure of the alloy,so that the impact absorbed energy reaches the highest value of 18.60 J.After single-stage aging,the precipitated phases in the alloy are rounded,and the tensile strength reaches the highest value of 202.56 MPa.After double-stage aging,fine needle-like precipitated phases are formed and the hardness reaches the highest value of 161.27 HBW.These results indicate that the double-stage aging has the best effect in improving hardness,the single-stage aging has the best performance in tensile strength,and the pre-aging is the most effective in improving impact properties.
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