Effects of gradient magnetic field on the solidification structure of aluminum under electromagnetic vibration

The effect of gradient high magnetic field on the structure refinement of pure Al has been investigated experimentally. It was found that during electromagnetic vibration 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. The micro-gravitational solidification and restraint of 'crystal shower' can be realized under gradient high magnetic field.