Study on Microstructural Evolution of Semi-solid Aluminum Alloy During Reheating State

The semi-solid aluminum alloy was prepared by a newly self-developed mechanical stirring machine for preparing continuous semi-solid slurry,and was reheated during semi-solid state;the changing principle of semi-solid microstructure was studied under different reheating temperature or time.The results show that the higher the holding temperature,the faster the grains grow up and sphericize,the shorter the holding time;the mean diameter of grains increases,the grains are sphericized and the liquid fraction increase with the prolongation of isothermal holding time.The suitable temperature of semi-solid Y112 aluminum alloy reheating is 565～575℃.