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Channel segregation during solidification and the effects of an alternating traveling magnetic field

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Abstract

The model proposed by Felicelli, Heinrich, and Poirier is used to simulate the solidification of a small two-dimensional domain of Pb-10 wt pct Sn alloy in the presence of electromagnetic stirring by different traveling fields, with or without gravity. Results show (a) enrichment of the bulk liquid by mush solute draining; (b) spontaneous formation of vertical channels, acting as ducts, significantly modified by the electromagnetic flow; and possibly (c) a finer periodic structure of subchannels. Only the last feature is sensitive to the mesh size and permeability value. Scaling analysis is used to balance Darcy, buoyancy, and electromagnetic phenomena. Attention is focused on the gradient zone at the solidification front. Electromagnetic forces can change the flow structure in the bulk liquid. In this way, they modify the pressure differences at the solidification front, changing the channel segregation pattern. Although they cannot eliminate the channels, they can control their positions and partly prevent the unsteadiness of buoyancy effects.

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Authors and Affiliations

  1. the Consejo de Investigaciones, Universidad Nacional de Rosario, Rosario, Argentina

    M. Medina (Professor)

  2. the EPM/CNRS Laboratory, Grenoble, France

    Y. Du Terrail (Senior Researcher)

  3. the EPM-Madylam, Grenoble Polytechnic Institute, and CNRS, Grenoble, France

    F. Durand (Professor) & Y. Fautrelle (Professor)

Authors
  1. M. Medina
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  2. Y. Du Terrail
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  3. F. Durand
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  4. Y. Fautrelle
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Medina, M., Du Terrail, Y., Durand, F. et al. Channel segregation during solidification and the effects of an alternating traveling magnetic field. Metall Mater Trans B 35, 743–754 (2004). https://doi.org/10.1007/s11663-004-0014-8

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  • DOI: https://doi.org/10.1007/s11663-004-0014-8

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