中文摘要：

采用电磁搅拌、功率超声、超声电磁复合场等不同物理场制备3003／4004铝合金复合铸锭。结果表明，在电磁搅拌作用下，界面附近4004合金一侧a（A1）组织从未施加外场的树枝状转变为花瓣状。在功率超声作用下，4004合金中口（A1）及共晶硅组织都得到了良好的细化。在超声和电磁场联合作用下，界面处4004合金中的a（A1）组织同样得到细化，并且界面处的共晶硅组织较单独超声铸锭的更细小，其形貌从未施加外场时的粗大板条状及施加超声后的细针状转变为细小短棒状。

英文摘要：

In order to improve the quality of clad ingots, diverse physical fields including electromagnetic stirring, power ultrasonic and compound field of ultrasonic and electromagnetic stirring were attempted to prepare clad ingots of 3003/4004 alloys. The solidification structures near the interface in clad ingots were investigated. The experiment results indicate that the solidification structure of 4004 alloy changes from dendritic crystals to petal-like grains when the clad ingot is treated by electromagnetic stirring. With the effect of power ultrasonic, the solidified microstructure of 4004 alloy exhibits the refinement of both primary a（A1） and eutectic silicon. Under the compound field, the primary a（A1） is refined, the morphology of eutectic silicon has a transition from a coarse plate-like form without treatment or thin acicular-like form with power ultrasonic to fine coral-like form.