The influence of pouring temperature on the solidified microstructure of Al-Cu alloy in semi-continuous casting has been simulated by a multi-scale simulation method.The modelings of temperature field and phase transformation in Al-Cu alloy in semi-continuous casting have been established based on coupling temperature field with microstructure evolution through solid fraction change.The calculated steady temperature field in the Al-Cu alloy was projected to a mesoscale area to determine the nucleation of cell in semi-continuous casting by calculating the average under-cooled rate of cell in liquid-solid phase transformation zone.The microstructures of the Al-Cu alloy with contents of 8% and 10% Cu have been simulated by the cellular atomaton poured at different temperature

including 50 K and 5 K higher than liquidus temperature as well as liquidus temperature with the casting velocity of 2 mm/s.The results indicate that the microstructure of Al-Cu alloy poured at near-liquidus temperature is superior to that of ones in conventional casting.The desirable microstructure with excellent grain size and distribution can be prepared with pouring at a larger range of near-liquidus temperature with the Cu content more than 8% or 10%.