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研究了旋转磁场去除液态铝合金熔体中夹杂物颗粒的效果。将铝硅过共晶合金凝固过程中析出的初生硅颗粒视为夹杂物颗粒。采用旋转磁场,研究了密度比周围铝熔体密度大的初生硅夹杂物颗粒在旋转磁场下的分布规律。利用光学显微镜和数码相机对凝固试样的宏观及微观组织进行观察。实验结果表明:旋转磁场可以有效去除液态铝合金熔体中的夹杂物颗粒,并且旋转磁场的除杂效果随着磁场频率的增大而显著增加。因此旋转磁场提供了一种高效的金属熔体净化的方法。
The effect of rotating magnetic field to remove inclusion particles in liquid aluminum alloy melt was studied. The primary silicon particles precipitated during the solidification of Al-Si hypereutectic alloy are regarded as inclusion particles. Using rotating magnetic field, the distribution of primary silicon inclusion particles with higher density than that of the surrounding aluminum melt under rotating magnetic field was studied. The macroscopic and microstructures of the solidified samples were observed with optical microscope and digital camera. The experimental results show that the rotating magnetic field can effectively remove inclusions particles in liquid aluminum alloy melt, and the removal effect of rotating magnetic field increases significantly with the increase of magnetic field frequency. Rotating the magnetic field therefore provides an efficient method of metal melt purification.