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Modification of liquid/solid interface shape in directionally solidifying Al–Cu alloys by a transverse magnetic field

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Abstract

Al-0.85wt%Cu and Al-2.5wt%Cu alloys were directionally solidified under different transverse magnetic field (TMF) intensities to investigate the influence of TMF on the liquid/solid interface shape with respect to the various length scales appearing (planar, cellular, and dendritic interfaces). Results show that planar and cellular interfaces tilt to one side and then level off with increasing TMF although the dendritic interface appears not to behave in this manner. In situ synchrotron X-ray imaging was applied during directional solidification of the Al-4wt%Cu alloy under a 0.08T TMF, revealing leveling of the initially sloped interface. Solute redistribution, caused by thermoelectric magnetic convection (TEMC), responds to the changes in the interface shape. Because different typical length scales should be used in estimating the velocity of TEMC for planar, cellular, and dendritic interfaces, the maximum velocity of the convection ahead of the interface is obtained under different TMF intensities; correspondingly, leveling of the interface’s degree of slop varies with TMF.

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Acknowledgements

This work is partly supported by the CNRS/ANR OPTIMAG project, the Natural Science Foundation of China (No. 50911130365) and the National 973 Project (No. 2011CB610404). The authors are indebted to Prof. Claude Esling at LETAM/CNRS-UMR, Metz, for helpful and fruitful discussions, Dr. Tamzin Lafford and Mr. Xavier Guichard at ESRF, Grenoble, for help with experiments, Dr. Simona Epure in our laboratory and Dr. Yangyang Fan at Worcester Polytechnic Institute, USA, their for fruitful help.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Shanghai University, Shanghai, 200072, People’s Republic of China

    Jiang Wang, Zhongming Ren, Xi Li & Yunbo Zhong

  2. SIMAP/EPM—Madylam, ENSHMG BP 75, 38402, St. Martin d’Heres Cedex, France

    Jiang Wang, Yves Fautrelle, Xi Li & Imants Kaldre

  3. Aix Marseille University, Campus Saint-Jerome, Case 142, 13397, Marseille Cedex 20, France

    Henri Nguyen-Thi, Nathalie Mangelinck-Noel & Georges Salloum Abou Jaoude

  4. CNRS, IM2NP, Campus Saint-Jerome, Case 142, 13397, Marseille Cedex 20, France

    Henri Nguyen-Thi, Nathalie Mangelinck-Noel & Georges Salloum Abou Jaoude

  5. University of Latvia/IPUL, Salaspils, Latvia

    Imants Kaldre & Andris Bojarevics

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  1. Jiang Wang
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  2. Zhongming Ren
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  4. Xi Li
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Correspondence to Zhongming Ren.

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Wang, J., Ren, Z., Fautrelle, Y. et al. Modification of liquid/solid interface shape in directionally solidifying Al–Cu alloys by a transverse magnetic field. J Mater Sci 48, 213–219 (2013). https://doi.org/10.1007/s10853-012-6730-6

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  • DOI: https://doi.org/10.1007/s10853-012-6730-6

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