Effects of RE and Pouring Temperature on Morphology of Primary Phase in Al-4.5Cu Alloy

The effects of addition amount of RE and pouring temperature on the morphology of primary phase in Al-4.5Cu alloy were investigated.The results show that semi-solid Al-4.5Cu alloy with non-dendrite structure can be obtained by adding tiny RE and controlling pouring temperature.With the decrease of pouring temperature,primary phase in the alloy with 0.5% RE changes from dendritic crystal to spherical crystal.When pouring temperature is 660 ℃,with the increase of RE addition,dendritic crystal changes from equiaxed crystal to rose-shape crystal,and transforms into spherical crystal.As pouring temperature decreasing,primary phase in the alloy without RE addition changes from large dendritic crystal to equiaxed crystal.