摘要：The morphology of primary α-Al and eutectic silicon in 4004 aluminum alloy under diverse physical fields was investigated .The diverse physical fields are ultrasonic ( UST ) or electro-magnetic (EMS), and their compound (UE).The results showed that the solidification structures of ingots could be refined by using UST or EMS solely .In particular , the high-intensity ultrasonic vibra-tion had a significant effect on refining eutectic silicon phase .When the compound field was imposed , both the primary aluminum phase and the eutectic silicon phase were refined , the refinement effect is nearly uniform with the samples treated by power ultrasonic solely , however , the refinement zone in compound field would be larger than sole UST or EMS .
