利用旋转磁场去除铝熔体中的夹杂物颗粒
Removing Inclusions from Molten Aluminum Alloy by Rotating Magnetic Field
何彦洁1,2， 李丘林1， 刘 伟2
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作者单位：(1.清华大学深圳研究生院 新材料所， 广东 深圳 518055； 2.清华大学 材料科学与工程系， 北京 100084
中文关键字：凝固组织； 旋转磁场； 过共晶铝硅合金； 初生硅颗粒； 分离
英文关键字：solidification structure; rotating magnetic field; hypereutectic aluminum silicon alloy; primary silicon particle; separation
中文摘要：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。
英文摘要：The effects of rotating magnetic field(RMF) on the removing inclusions in the molten aluminum alloy were investigated. The primary silicon particles precipitating from the solidification of Al-Si hypereutectic alloy was regarded as inclusions. An experimental apparatus applied with RMF was employed to study the distribution of silicon particle with density larger than its surrounding molten aluminum alloy under magnetic field. The macrostructure and microstructure of the solidified samples was observed by digital camera and optical microscopy, respectively. The results show that the silicon particles from the molten alloy can be eliminated by RMF. The separating effect of RMF increases with the increase of RMF frequency. RMF can provide a highly effective approach for metal purification.