The containerless rapid solidification of al - 32 . 7wt % cu eutectic alloy in drop tube is investigated . the " lamellar eutectic - anomalous eutectic " microstructural morphology transition occurs with the decrease of droplet size 采用落管無容器處理技術(shù)研究了al - 32 . 7wt cu二元共晶合金在深過冷條件下的快速凝固規(guī)律。