The influence of alternating magnetic fields on structure formation in Al-Si alloys during solidification


The influence of alternating magnetic fields on structure formation in Al-Si alloys during solidification

Willers, B.; Dong, J.; Metan, V.; Smieja, F.; Eckert, S.; Eigenfeld, K.

Solidification experiments were carried out using binary Al-Si alloys and the technical alloys AlSi9Cu3 and AlCu4TiMg. In this paper we present results obtained from solidification in a cylindrical container made from stainless steel exposed to rotating or travelling magnetic fields, respectively. The container bottom is positioned on a water-cooled copper chill allowing a directional solidification by a vertical heat flux. In parallel, the solidification in sandcasting was studied as well. Local temperatures were determined during the solidification process using a set of thermocouples. Our results disclose that the forced convection causes distinct modifications of the temperature and the concentration field. The electromagnetic stirring promotes the columnar-to-equiaxed transition (CET) and causes a considerable grain refinement. Modifications of the grain structure and effects of macrosegregation are discussed with respect to the flow field.

Keywords: solidification; Al-Si alloys; magnetic field; convection; dendritic growth

  • Contribution to proceedings
    5th Decennial International Conference on Solidification Processing, 23.-25.07.07, Sheffield, United Kingdom
    Proceedings of the 5th Decennial International Conference on Solidification Processing, Sheffield, 978-0-9522507-4-6, 168-171
  • Lecture (Conference)
    5th Decennial International Conference on Solidification Processing, 23.-25.07.2007, Sheffield, United Kingdom

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Publ.-Id: 9296