The structure evolution of ZL109 alloy and 7050 alloy was studied during the process of preparing the raw billet by low super heat casting

remelting

semisolid forming and heat treatment.The thin and symmetrical structure were obtained by using low super heat casting process. The eutectic that lied inside the raw billet of ZL109 alloy melted and came into being liquid phase in the process of remelting

but to the 7050 alloy

the structure of intergranular was fist melted that made grain more uniform and smooth.In the process of semisolid forming

the first αphase and eutectic inside the ZL109 alloy were separated partly and the grain inside the 7050 alloy was drew out along the way of the stress.After heat treated

the sohericity Si phase inside the ZL109 alloy diffused equably in the firstαphase

but to the 7050 alloy

the βphase was discovered in the intergranular and the grain was no longer smoothly like before.