Aging strengthening characteristics and microstructure of Al-Mg-Si,Al-Mg-Si Ag,Al-Mg-Si-Cu alloys under different aging treatment conditions were investigated by hardness testing,tensile testing,microscopic inspection.The results show that the addition of Ag improves the hardness value of the alloy during peak aging with a peak hardness of 141.01 HV0.5,representing an increase of 9.35％and 1.53％compared to that of Al-Mg-Si and Al-Mg-Si-Cu alloys.The smaller average size and wider dispersion of the precipitation-strengthening phase β"formed during the peak aging stage of the Al-Mg-Si-Ag alloy contribute to a reduction in length by 40.05％and 23.09％compared to that of the Al-Mg-Si and Al-Mg-Si-Cu alloys,and the spatial distribution is more dispersed.According to comparative tests,the Ag microalloying has a more significant precipitation strengthening effect on Al-Mg-Si alloy.Therefore,the Al-Mg-Si-Ag alloy has better comprehensive properties,demonstrating that this research may provide some theoretical support for the development of heat treatment processes for designing new types of automobile body sheet.
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