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利用交变磁场在金属液内部形成的感应磁场对金属液产生搅拌等作用,研究了外加交变磁场对倾斜管(内径为80mm)过流冷却法制备的半固态A356铝合金浆料的流动行为和组织的影响。结果表明,洛仑兹力使得近直线流动的金属液呈正弦波形流动,管壁的非均质形核作用增强,先共晶相的形核率明显增加。磁场强化金属液内部的对流,但抑制金属液深度过冷,从而抑制先共晶相的择优长大。磁场作用下过流冷却制备的半固态组织中先共晶相明显细化和球化,组织均匀性显著增加。
The alternating magnetic field was used to stir the molten metal induced by the magnetic field induced by the alternating magnetic field. The flow of semi-solid A356 aluminum alloy slurry prepared by overcurrent cooling with inclined tube (inner diameter 80mm) The impact of behavior and organization. The results show that the Lorentz force makes the near-linear flow of liquid metal flow sinusoidally, the heterogeneous nucleation of the tube wall is enhanced, and the nucleation rate of the eutectic phase is obviously increased. The magnetic field strengthens the convection inside the molten metal, but suppresses the depth of the molten metal from becoming too cold, thereby suppressing the preferential growth of the pre-crystallized phase. Under the action of magnetic field, the first eutectic phase in the semi-solid microstructure prepared by overcurrent cooling is obviously refined and spheroidized, and the homogeneity of the microstructure is significantly increased.