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通过微观组织分析研究了在旋转磁场作用下Al-7Si-8.9Mg2Si复合材料的凝固组织特征。结果表明,合金凝固组织经过电磁搅拌后初生Mg2Si相明显细化,仅在近液态和半固态施加旋转磁场使得二元共晶Mg2Si的形状变化很小,在凝固全程施加旋转磁场反而使得组织粗化。在半固态施加旋转磁场能有效细化Al-7Si-8.9Mg2Si复合材料凝固组织中初生Mg2Si和共晶Mg2Si相,并使得α-Al相变得细小且非枝晶化。
The microstructure of Al-7Si-8.9Mg2Si composite under the action of rotating magnetic field was investigated by microstructure analysis. The results show that the primary Mg2Si phase of the solidified microstructure of the alloy is obviously refined after electromagnetic stirring, and only the rotating magnetic field is applied in near-liquid state and semi-solid state, so that the shape of the binary eutectic Mg2Si changes very little. . The application of rotating magnetic field in the semi-solid state can effectively refine the primary Mg2Si and eutectic Mg2Si phases in the solidified microstructure of Al-7Si-8.9Mg2Si composites and make the α-Al phase fine and non-degenerated.