实验研究了磁场强度和恒温时间对Al-18Si合金中偏聚初晶硅晶粒尺寸的影响。结果表明：无磁场时初晶硅为粗大的板条状或五星状，施加梯度磁场时偏聚初晶硅呈弥散分布的小块状或粒状，初晶硅显著细化。当磁化力维持不变时，偏聚初晶硅晶粒尺寸随磁场强度的增大而减小，晶粒数量密度随磁场强度的增加而增大。实验结果预示强磁场影响了扩散。建立了磁场抑制扩散的理论模型及初晶硅的受力模型，较好地解释了实验结果。
The effects of a gradient high magnetic field on the morphology and distribution of the primary silicon grains in Al-18Si alloy have been investigated experimentally. It is shown that in the gradient high magnetic field the primary silicon phase grains, which are large plate-like or five-star-like in the case of solidification without magnetic field, are accumulated on the top of the specimen and refined remarkably with the morphology of polygonal or nodular shapes when the alloy solidifies from the semisolid state. In the segregated layer of the silicon, the distribution of the silicon grains is homogeneous. The size of the primary silicon grains decreases and the grain number density rises with the increase of the magnetic strength maintaining the magnetization force unchangeable. It seems that the high magnetic field influences the diffusion of silicon. Theoretical models have been proposed to explain the refining and the distribution of the silicon grains.
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