Three groups macro-micro characteristics in the cross section of A356semi-solid slurry incision were observed.The results show that the basic morphology

size and distribution of primary phases in the slurry prepared can be evaluated roughly through the characteristics in the cross section of the incision.The primary grains in untreated alloy melt present coarsening equiaxed grain and dendrite with varied size and uneven distribution.The primary grains in alloy treated through the helical curve duct present more tiny uniform distributed spheroidization or nearly spheroidizaed morphology.