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As-cast structure of DC casting 7075 aluminum alloy obtained under dual-frequency electromagnetic field
Authors:Zhi-hao Zhao  Zhen Xu  Gao-song Wang  Qing-feng Zhu  Jian-zhong Cui
Institution:1. The Key Laboratory of the Ministry of Education of China for Electromagnetic Processing of Materials, Northeastern University, Shenyang, 110819, China
Abstract:We have experimentally determined the as-cast structures of semi-continuous casting 7075 aluminum alloy obtained in the presence of dual-frequency electromagnetic field. Results suggest that the use of dual-frequency electromagnetic field during the semi-continuous casting process of 7075 aluminum alloy ingots reduces the thickness of the surface segregation layer, increases the height of the melt meniscus, enhances the surface quality of the ingot, and changes the surface morphology of the melt pool. Moreover, low-frequency electromagnetic field was found to show the most obvious influence on improving the as-cast structure because of its high permeability in conductors.
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