进行了纵向强磁场下MnBi/Bi共晶定向凝固实验研究, 并从热力学的角度分析了强磁场对 MnBi/Bi共晶定向凝固组织的影响. 发现磁场有利于纤维状MnBi/Bi共晶定向凝固组织的 形成, 扩大了形成纤维状共晶组织的速度范围; 在同一生长速度下随着磁场强度的增加, MnBi/Bi共晶纤维组织变得更加规则, MnBi纤维粗化, 纤维间距增大; 而且强磁场的施 加, 使MnBi的形态发生了变化, 小平面生长特性增强.
Effect of high vertical magnetic field on the directional solidification structure of eutectic MnBi/Bi has been investigated. It has been found that high magnetic field has enhanced the formation of MnBi fiber and make the directional solidification structure of eutectic MnBi/Bi more regular; with the increase of the intensity of the magnetic field, the average spacing and diameters of MnBi fibers increase at same growth rate; magnetic field makes the morphology of MnBi phase change and enhances the faceted growth character of MnBi phase.
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