Papers by Author: Ming Wang

Abstract: A new method of helical curve duct (HCD) to prepare semi-solid slurry was investigated. The semi-solid slurry of A356, AZ91, Cu-2.21wt%Ca (0.45wt%Ce) alloys were prepared through this method of HCD. Comparison of the microstructures of slurry prepared through the helical curve duct with different structure parameters and process parameters are made and the effects of structure and process parameters on microstructures are analyzed. The results show that the melt is stirred effectively by flowing through the helical curve duct and the semi-solid slurry of alloys could be prepared through the helical curve duct process; Spherical microstructures of alloy slurry were obtained through controlling or adjusting the process parameters to control solidification conditions.

Abstract: Rotating tube method for preparing Cu-Ca alloy semi-solid slurry was investigated. Compared the microstructure of slurry prepared through the tube and of untreated original sample, discussed evolution characteristics of microstructure flowing through the rotation tube, and analyzed effect of process parameter on microstructure. The results show that the semi-solid slurry of Cu-Ca alloy could be prepared through rotating tube process; the melt were hardly affected in the initial stage. The tube began to play a major part in the next stage and the melt were stirred effectively in the last stage; Spherical microstructures of Cu-Ca alloy slurry were obtained through controlling or adjusting the process parameters to control solidification conditions.