本文实验研究了梯度磁场对纯Al在强磁场和交流电复合所产生的电磁振荡下凝固组织的影响规律。发现在不同的梯度磁场中，施加电磁振荡凝固后纵截面细化组织分布发生很大变化。建立模型分析了这一现象，结果表明初生晶核在梯度磁场中所受有效磁悬浮力影响了细化组织分布规律。利用梯度磁场这一效应，可以控制凝固过程中的“结晶雨”现象和模拟无重力凝固。
The effect of gradient high magnetic field on refined structures distribution has been investigated experimentally during electromagnetic vibration of Al. It was found the refining region was influenced by the magnetization force and gravity. A model responsible for the magnetization force—restrain migratation of crystal grains has been proposed based on the classical dynamics, in which the grain is treated as a spheroid. A theoretical expression was derived for the migratation of grain as a function of applied magnetic intensity and gradient. We can achieve micro-gravitational solidification and restrain “crystal shower” under gradient high magnetic field.
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