Study on Heat Treatment Process of the New Al-Mg-Si-Cu Aluminum Alloy

The heat treatment process of the new Al-Mg-Si-Cu aluminum alloy (Al-1.2%Mg-0.9%Si-0.6%Cu) was studied by the mechanical properties measurement and metallographic observation.The results showed that a reasonable heat treament process of the alloy was solution at 550℃ for 2 hours,then quenched with water,aging at 185℃ for 2 hours followed by 200℃ for 1 hour.Its tensile strength can reach over 340 MPa,hardness over 105HB and elongation over 12% after the heat treatment.The formation of fine and dispersed precipitates has an excellent hardening effect on the alloy.