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Convectional controlled crystal–melt interface using two-phase radio-frequency electromagnetic heating

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Abstract

The radio frequency floating-zone growth of massive intermetallic single crystals is very often unsuccessful due to an unfavourable solid–liquid interface geometry enclosing concave fringes. This interface depends on the flow in the molten zone. A tailored magnetic two-phase stirrer system has been developed which enables the controlled influence on the melt flow ranging from intense inwards to outwards flows. Depending on the phase shift between the two induction coils, a transition from a double vortex structure to a single vortex structure is created at a preferable phase shift of 90°. This change in the flow field has a significant influence on the shape of the solid–liquid interface. Due to their attractive properties for high temperature applications such as high melting temperature, low density, high modulus and good oxidation resistance, the magnetic system was applied to the crystal growth of TiAl alloys.

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Acknowledgements

The financial support of the Deutsche Forschungsgemeinschaft within the SFB 609 “Elektromagnetische Strömungsbeeinflussung in Metallurgie, Kristallzüchtung und Elektrochemie” is gratefully acknowledged.

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Authors and Affiliations

  1. Leibniz Institute of Solid State and Materials Research IFW Dresden, Mail-box 270016, 01171, Dresden, Germany

    R. Hermann, G. Behr & B. Büchner

  2. Forschungszentrum Dresden-Rossendorf, MHD Department, Mail-box 510119, 01314, Dresden, Germany

    G. Gerbeth

  3. Applied Mathematics Research Centre, Department of Mathematical Sciences, Coventry University, Priory Street, Coventry, CV1 5FB, UK

    J. Priede

  4. Institute of Physics, University of Latvia, LV-2169, Salaspils, Miera 32, Latvia

    A. Krauze

Authors
  1. R. Hermann
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  2. G. Gerbeth
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  3. J. Priede
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  4. A. Krauze
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  5. G. Behr
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  6. B. Büchner
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Correspondence to R. Hermann.

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Hermann, R., Gerbeth, G., Priede, J. et al. Convectional controlled crystal–melt interface using two-phase radio-frequency electromagnetic heating. J Mater Sci 45, 2228–2232 (2010). https://doi.org/10.1007/s10853-009-4117-0

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  • DOI: https://doi.org/10.1007/s10853-009-4117-0

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