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X-Ray Radioscopic Visualization of the Solutal Convection during Solidification of a Ga-30 Wt Pct In Alloy

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Abstract

Capabilities of the X-ray attenuation contrast radioscopy were used to provide a real-time diagnostic technique of the melt flow during unidirectional solidification of a Ga-30 wt pct In alloy from the bottom, which is significantly affected by solutal convection. The solidification process was visualized using a microfocus X-ray tube. The X-ray facility provided shadow radiographs at spatial resolutions of about 10 μm at frame repetition rates of 25 Hz. The optical flow approach was used to derive information about the velocity field ahead of the solidification front and in the mushy zone from the observed displacement of the brightness patterns appearing during the X-ray image sequence. Buoyancy-driven flow patterns were found at length scales much larger than the length scales of the solidifying microstructure. A strong coupling between convection and dendritic growth became apparent via flow-induced modifications of the concentration profile in the liquid.

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Acknowledgments

This work was financially supported by Deutsche Forschungsgemeinschaft (DFG) in the form of the collaborative research center SFB 609 “Electromagnetic Flow Control in Metallurgy, Crystal Growth and Electrochemistry.”

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Authors and Affiliations

  1. MHD Department, Forschungszentrum Dresden-Rossendorf, 01314, Dresden, Germany

    S. Boden (Postgraduate Student), S. Eckert (Group Leader), B. Willers (Senior Research Scientist) & G. Gerbeth (Department Head)

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  1. S. Boden
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  2. S. Eckert
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  3. B. Willers
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  4. G. Gerbeth
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Correspondence to S. Eckert.

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Manuscript submitted June 28, 2007.

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Boden, S., Eckert, S., Willers, B. et al. X-Ray Radioscopic Visualization of the Solutal Convection during Solidification of a Ga-30 Wt Pct In Alloy. Metall Mater Trans A 39, 613–623 (2008). https://doi.org/10.1007/s11661-007-9462-5

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