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Influence d'un champ magnétique glissant sur la solidification dirigée des alliages métalliques binaires

Abstract : In the field of the metallic alloys development, principal industrial goals are the control of the metallurgical structure and defects. Hydrodynamic movements in the liquid phase have a significant influence on properties of the solidified product. In order to study the influence of a forced convection on the directional solidification of binary metallic alloys, a new device made up of a Bridgman type furnace and a Bitter coil to produce a travelling magnetic field was designed and developed. We focused our attention on two major effects influenced by the forced convection: the macrosegregation and the grain structure. The velocity and the direction of the forced flow can be controlled thanks to the application of the travelling magnetic field. We have shown that this configuration can control macrosegregations and that moreover, the dendritic primary spacing is modified according to the applied field. With regard to the grain structure, using an analytical model, we have shown that the extension of the solutale layer in front of the solidification front varies according to the direction of the flow near the mushy zone. This mechanism enhances the nucleation and the growth of equiaxed grains. In the case of non refined alloys, a mode of elongated free grains could be probably obtained by fragmentation under a range of magnetic field.
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Contributor : Kader Zaidat <>
Submitted on : Friday, November 18, 2005 - 3:19:36 PM
Last modification on : Tuesday, October 15, 2019 - 1:13:45 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:55:55 PM


  • HAL Id : tel-00011040, version 1



Kader Zaidat. Influence d'un champ magnétique glissant sur la solidification dirigée des alliages métalliques binaires. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2005. Français. ⟨tel-00011040⟩



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