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High Magnetic Field-Induced Formation of Banded Microstructures in Lamellar Eutectic Alloys During Directional Solidification

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Abstract

The influences of high magnetic field (up to 12 T) on the morphology of Pb-Sn and Al-Al2Cu lamellar eutectics during directional solidification were investigated. The experimental results indicate that, along with a decrease in eutectic spacing, the banded structure forms at lower growth speeds under high magnetic field and the band spacing decreases as the magnetic field increases. Moreover, the application of a magnetic field enriches the Cu solute in the liquid ahead of the liquid/solid interface during directional solidification of an Al-Al2Cu eutectic alloy. The effects of high magnetic field on the eutectic points of non-ferromagnetic alloys and the stress acting on the eutectic lamellae during directional solidification have been studied. Both thermodynamic evaluation and DTA measurements reveal that the high magnetic field has a negligible effect on the eutectic points of non-ferromagnetic alloys. However, the high magnetic field caused an increase of the nucleation temperature and undercooling. The numerical results indicate that a considerable stress is produced on the eutectic lamellae during directional solidification under high magnetic field. The formation of a banded structure in a lamellar eutectic during directional solidification under high magnetic field may be attributed to both the buildup of the solute in the liquid ahead of the liquid/solid interface and the stress acting on the eutectic lamellae.

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Acknowledgments

This work is supported partly by Bl-inter 09_473220, National Natural Science Foundation of China (Nos. 51271109 and 51171106) and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning. Authors are indebted to Professor Thierry Duffar in SIMAP, Grenoble, for helpful and fruitful discussions.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, P.R. China

    Xi Li (Professor) & Zhongming Ren (Professor)

  2. SIMAP-EPM-Madylam/G-INP/CNRS, UJF, PHELMA, BP 75, 38402, St Martin d’Heres Cedex, France

    Xi Li (Professor), Yves Fautrelle (Professor), Annie Gagnoud (Professor) & Rene Moreau (Professor)

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  1. Xi Li
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  2. Yves Fautrelle
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  3. Annie Gagnoud
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  4. Zhongming Ren
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  5. Rene Moreau
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Correspondence to Xi Li.

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Manuscript submitted April 23, 2015.

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Li, X., Fautrelle, Y., Gagnoud, A. et al. High Magnetic Field-Induced Formation of Banded Microstructures in Lamellar Eutectic Alloys During Directional Solidification. Metall Mater Trans A 47, 4038–4052 (2016). https://doi.org/10.1007/s11661-016-3557-9

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  • DOI: https://doi.org/10.1007/s11661-016-3557-9

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