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| On Dynamics of Grain Alignment During Alloy Solidification Under Applied Magnetic Field |
| ZHANG Bangwen; REN Zhongming; WANG Hui; LI Xi; ZHUANG Yunqian |
| Shanghai Enhanced Laboratory of Ferro--Metallurgy; Shanghai University; Shanghai 200072 |
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Cite this article:
ZHANG Bangwen; REN Zhongming; WANG Hui; LI Xi; ZHUANG Yunqian. On Dynamics of Grain Alignment During Alloy Solidification Under Applied Magnetic Field. Acta Metall Sin, 2004, 40(6): 604-.
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Abstract A model responsible for the magnetic--induced rotation of single anisotropic grain in free medium has been proposed firstly based on the classical dynamics of rigid body, in which the grain is treated as a prolate spheroid. A theoretical expression was derived for the alignment time of grain as a function of viscidity of liquid matrix, aspect ratio of grain, difference of anisotropic magnetic susceptibility of grain and applied magnetic intensity. It was applied to predict the alignment time of paramagnetic superconductor material Bi--2212 and ferromagnetic material Bi--3%Mn in melt processing. An experiment was conducted for the latter melted fully at 300℃ then rapidly quenched under different applied magnetic field, and the MnBi texture is obtained. It is found that the alignment time is less than one second, in good agreement with the theoretical prediction.
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Received: 30 June 2003
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