Effect of Homogenization Treatment on Microstructure and Properties of Al-0.53Mg-0.73Si-0.20Cu-0.23Mn Alloy as Cast
The effects of different homogenizing systems on the microstructure and properties of Al-Mg-Si aluminum alloy were stud-ied by testing mechanical properties,electrical conductivity and metallographic microscopy,SEM and XRD.The results show that with the increase of single-stage homogenizing temperature,the dendrite network in the cast ingot is discontinuous,and the eutectic dissolves at low melting point.The strengthening effect is mainly solid solution strengthening,supplemented by dispersion strengthen-ing,with the strength first decreasing and then increasing.The strength is highest when using a dual-stage homogenizing system that starts at low temperature and then at high temperature,and the strength is lowest when using a dual-stage homogenizing system that starts at high temperature and then at low temperature,while the conductivity trend is opposite.Comprehensive analysis of cast ingot structure and properties,450℃×3h+550℃×6 h is the optimal homogenizing process for this Al-Mg-Si alloy.
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