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Chimney Formation in Solidifying Ga-25wt pct In Alloys Under the Influence of Thermosolutal Melt Convection

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Abstract

The directional solidification of Ga-25wt pct In alloys within a Hele-Shaw cell under the influence of thermosolutal convection was observed by means of X-ray radioscopy. The unstable density stratification at the solidification front causes the formation of rising plumes containing solute-rich liquids. The development of the chimneys and the probability of their surviving depend sensitively on the spatial and temporal properties of the flow field. Variations of the vertical temperature gradient along the solidification cell lead to the observation of different mechanisms for chimney formation. Perturbations of the dendritic structure are the origin of development of segregation freckles in case of low temperature gradients. The long-term stabilities of these segregation channels are strongly influenced by the transient nature of the melt convection. The situation at higher temperature gradients is characterized by two dominating convection rolls in the liquid phase which are driven by a lateral temperature gradient and the convex shape of the solidification front. The penetration of this flow pattern into the mushy zone results in continuous accumulation of solute in the central part of the mushy zone followed by a remelting of the solid fraction and the occurrence of a stable chimney.

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Acknowledgments

The current study was financially supported by the Deutsche Forschungsgemeinschaft (DFG) in the form of the Collaborative Research Centre SFB 609: “Electromagnetic Flow Control in Metallurgy, Crystal Growth and Electrochemistry.”

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Authors and Affiliations

  1. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, P.O. Box 510119, 01314, Dresden, Germany

    Natalia Shevchenko (Research Fellow), Stephan Boden (Research Fellow), Gunter Gerbeth (Institute Director) & Sven Eckert (Head of Magnetohydrodynamics Department)

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  1. Natalia Shevchenko
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  2. Stephan Boden
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  3. Gunter Gerbeth
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  4. Sven Eckert
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Correspondence to Natalia Shevchenko.

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Manuscript submitted November 16, 2012.

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Shevchenko, N., Boden, S., Gerbeth, G. et al. Chimney Formation in Solidifying Ga-25wt pct In Alloys Under the Influence of Thermosolutal Melt Convection. Metall Mater Trans A 44, 3797–3808 (2013). https://doi.org/10.1007/s11661-013-1711-1

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  • DOI: https://doi.org/10.1007/s11661-013-1711-1

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