The application of physical fields is currently a common method to improve the solidification structure of Al alloys. In this study, rotating magnetic field (RMF) and power ultrasonic field (USF) were applied during the solidification process of Al-8 wt.%Si alloy. The experimental results have been compared to those of conventional casting and have verified that the alloys processed under individual RMF or USF exhibit obvious refinement in their solidification structure as well as an enhancement in the mechanical properties. However, the refinement under RMF is not fully effective, while the ultrasonically treated region is inadequate. For the case of the compound fields, it could be furthermore observed that these improvements become more pronounced. Owing to the advantages of both RMF and USF, RMF enlarges the ultrasonic treated region, and USF improves the refinement effect of RMF as well.
 S.Eckert, P.Nikrityuk, B.Willers, D.Räbiger, N.Shevchenko, H.Neumann-Heyme, V.Travnikov, S.Odenbach, A.Voigt, K.Eckert: Eur. Phys. J. Spec. Top.220 (2013) 123. 10.1140/epjst/e2013-01802-7Search in Google Scholar
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