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中文摘要：
实验研究了梯度强磁场下Al-18％Si（质量分数）合金中偏聚初晶硅的形貌及晶粒尺寸的变化．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等轴多边形,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,晶粒数密度随磁场强度的增加而增大．实验结果预示,强磁场影响Si原子扩散．对磁场抑制扩散及初品硅颗粒的受力进行了分析,较好地解释了实验结果．
英文摘要：
The effects of a gradient high magnetic field on the morphology and distribution of the primary silicon grains in Al-18%Si （mass fraction） alloy have been investigated experimentally. It is shown that in the gradient high magnetic field the primary silicon 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 equiaxed polygon when the alloy solidified 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 field intensity under same magnetization force. It seems that the high magnetic field influences the diffusion of silicon atoms. A theoretical analysis has been proposed to explain the refinement and the distribution of the silicon grains.
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