Effect of Heat Treatment on Mechanical Properties of Multi-Component Al-Si Alloy

In order to study the influence of heat treatments on the comprehensive mechanical properties of multiple Al-Si alloy,the alloy specimens in the state of as-cast,water quenching+aging treatment and aging treatment,were carried out in testing machine of 3 000 kN,the microstructures of the alloy were analyzed by the optical microscope and SEM,then the mechanical properties were tested.The results show that,the mechanical property of the multi-component Al-Si alloy treated by as-cast water quenching+aging is the best among the three states,and then the aging treatment,the mechanical property of as-cast is the worst.For as-cast water quenching is equivalent to a transient solution treatment,dispersed phases(Al2Cu、Mg2Si and θ′ phases etc).would integrate into α solid solution in the solution treatment,then separated out in the aging treatment,which drastically improved the mechanical properties of the alloy.