Abstract
The feasibility and effectiveness of a novel combined magnetic field (CMF) on the removal of inclusions with a density smaller than the surrounding melt were investigated. The experiment of the separating effect of CMF was conducted on a laboratory-scale apparatus by the simultaneous application of a rotating magnetic field (RMF) and a downward traveling magnetic field (TMF). Primary silicon particles precipitating from the solidification process of Al-Si-Cu alloy were regarded as the inclusions in a molten aluminum alloy. It was found that a CMF consisting of both a RMF and a downward TMF was able to separate silicon particles from the molten Al-Si-Cu alloy by making these particles migrate vertically toward the upper part of the samples. Compared with downward TMF or RMF, CMF improved the separating effectiveness substantially. It was proposed that this type of CMF was approved to be highly effective at eliminating the inclusions with a density smaller than the surrounding molten alloy. A tentative mechanism for the high separating effect of CMF was discussed.
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The study was supported by the National Nature Science Foundation of China (No. 50904042).
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Manuscript submitted December 2, 2011.
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He, Y., Li, Q. & Liu, W. Separating Effect of a Novel Combined Magnetic Field on Inclusions in Molten Aluminum Alloy. Metall Mater Trans B 43, 1149–1155 (2012). https://doi.org/10.1007/s11663-012-9676-9
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DOI: https://doi.org/10.1007/s11663-012-9676-9