Semi-solid slurry of A356 alloy was produced by cooling-slope-tube.Nucleation behavior and morphology evolution of primary phase under the main process parameters were investigated.A ingot was made by the cooling-slope-tube and the microstructure of different positions were also studied.The results show that the optimum inclined angle is between 40°

6

0°and pouring temperature is between 620 ℃～660 ℃.Correspondence different pouring temperature applied different sloped tube length

the cooling-slope-tube is cooled with water can acquire perfect microstructure.In a certain pouring length

low superheat pouring can obtain nearly globularity microstructure more easier.the dendritic primary phase transformed into a non-dendritic one in ingots cast over a cooling-slope-tube.