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Distribution of alloying elements and the corresponding structural evolution of Mn–Sb alloys in high magnetic field gradients

Published online by Cambridge University Press:  31 January 2011

Tie Liu ,
Qiang Wang ,
Ao Gao ,
Hongwei Zhang ,
Kai Wang  and
Jicheng He
Tie Liu
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China
Qiang Wang*
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China; and Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720
Jicheng He
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China
*
a)Address all correspondence to this author. e-mail: wangq@epm.neu.edu.cn
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Abstract

The distribution of alloying elements and the corresponding structural evolution of Mn–Sb alloys in magnetic field gradients were investigated in detail. It was found that a high magnetic field gradient could control the distribution of solute element in the alloys during the solidification process and therefore resulted in the coexistence of both primary MnSb and Sb phases or the aggregation of the primary MnSb with a continuous change in morphology. The positions where these primary phases located depended on the direction of field gradient. The control of the solute element distribution by a high magnetic field gradient was realized through the magnetic buoyancy force that could drive the migration of Mn element in the melt, originating from the difference in the magnetic susceptibility between Mn and Sb. The effectiveness of this control depends on the alloy composition, specimen dimension, cooling rate, and |BdB/dz| value.

Keywords

AlloyMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 9 , September 2010 , pp. 1718 - 1727
Copyright
Copyright © Materials Research Society 2010

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