Preparation of large-volume semi-solid slurry of Al-Zn-Mg-Cu aluminum alloy by weak electromagnetic stirring

The large-volume semi-solid slurry of 7A04 aluminum alloy was prepared by electromagnetic stirring with power of less than 1 kW/kg, and the effects of pouring temperature, stirring power and stirring time on the slurry were investigated. The results indicate that primary α(Al) particles of large-volume semi-solid slurry of 7A04 aluminum alloy becomes finer, and average shape factor first increases and then keeps stable with decreasing pouring temperature, increasing stirring power and stirring time under the condition of this work. The large-volume semi-solid slurry of 7A04 aluminum alloy with primary α(Al) particles of average equivalent diameter of 73.5 μm and average shape factor of 0.57 is obtained under pouring temperature of 650℃, nominal stirring power of 0.6 kW/kg and stirring time of 40 s.