Grain Refinement Induced by a Pulsed Magnetic Field and Synchronous Solidification
Grain Refinement Induced by a Pulsed Magnetic Field and Synchronous Solidification
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DOI：
10.1080/10426914.2011.564251
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发表时间：
2011-07
影响因子：
4.8
通讯作者：
Zhilong Zhao;Yan Liu;Lin Liu
中科院分区：
文献类型：
--
作者：
Zhilong Zhao;Yan Liu;Lin Liu
本文报道了脉冲磁场对纯铝定向凝固影响的实验研究。由PMF引起的强制对流促进了凝固前沿之前的液体区域的热均匀化。同时，在高磁场强度下发生同步凝固，在整个铸锭中形成细小的等轴晶。随着磁场强度的增加，凝固时间呈现出从初始上升到随后下降的趋势。最后，铸件中各个温度测量点的凝固时间在0.154 T的磁场强度处接近会聚点，在该会聚点处，铸锭中出现最细的晶粒尺寸。讨论了应用保偏光纤的热力学表达式。
An experimental study on the influence of a pulsed magnetic field (PMF) on the unidirectional solidification of pure aluminum is reported. The forced convection induced by PMF encourages a thermal homogenization of the liquid zone ahead of the solidification front. Meanwhile, synchronous solidification occurs under high magnetic intensity to form fine equiaxed grains in the entire ingot. The solidification time exhibits a trend of going from initial ascent to subsequent decent with increasing magnetic intensity. Finally, the solidification times of various temperature measurement points in the casting approach a convergence point at a magnetic intensity of 0.154 T, at which the finest grain size appears in the ingots. A thermodynamic expression with the application of PMF is discussed.