Based on the dynamic material model

the processing maps of LY11 alloy in the solid state and in semi-solid state were established. The instability zones of flow behavior were recognized by the maps. The results show that the instability zone during semi-solid forming process is more sensitive to strain rate than that of solid forming process. In addition

optimized processing parameters in the temperature range and different strain rates were presented by the maps. The optimized parameters are as follows: heating temperature of 560℃

strain rate of 0.001s-1 under semi-solid forming conditions

and heating temperature of 400 ℃ and strain rate of 0.001s-1 under solid forming conditions.