In development of high strength magnesium alloys with large elongation for medium plate, effect of rolling process and heat treatment of magnesium alloy on mechanical properties of rolled Mg-Al-Mn-Ca (AMX alloy) and Mg-Al-Zn-Ca (AZX alloy) alloys with thickness of 3 mm were investigated used by cast materials. The casting and rolling process and mechanical properties of flame-resistance AMX and AZX alloy were examined. Casting is carried out by the antigravity suction casting process and then subjected to hot rolling. The microstructure and mechanical properties of the cast alloy were dependent on the cooling rate and molten metal temperature. In rolling process, the dendrite structure was also elongated in the rolling direction after total reduction in thickness of 60%. The existence of shear deformation of the microstructure when the total reduction more than 60%, this stage, Al-Ca compounds were beginning to be crushed. As the result, we were able to rolled plate of 3 mm in thickness of this alloy subjected to rolling process showed a high tensile strength and large elongation by dynamic recrystallization and recovery.
