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<p>The morphology, size, and distribution of second phases, such as α-Al, eutectic Si, and Mg<sub>2</sub>Si, are crucial to enhance the mechanical properties of as-cast Al-Si-Mg alloys. The microstructure of Al-Si-Mg alloys was regulated by a ZrCu-based amorphous alloy, and analyzed by optical microscopy (OM) and scanning electron microscopy (SEM), and the influence of the content of regulator, regulation time, and heat treatment on the microstructure evolution was studied. The results show that ZrCu-based amorphous alloys can refine α-Al grains and promote the refinement and morphology change of eutectic Si. When the content of amorphous alloy regulator was 0.1&#xa0;wt.% and the regulation time was 10&#xa0;min, the α-Al dendrites were significantly refined, the average size was 23.49&#xa0;μm, and the distribution was equiaxial or nearly spherical. The eutectic Si structure was uniformly dispersed, and the average size and length–width ratio were 3.48&#xa0;μm and 2.5&#xa0;μm, respectively. After heat treatment, the length–width ratio of eutectic Si decreased from 2.5 to 2.1, and the grain size of the second-phase Mg<sub>2</sub>Si decreased and the distribution was more uniform.</p>

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Regulation of Trace ZrCuTiNiBe Amorphous Alloy on Al-Si-Mg Alloy Microstructure

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Yiqing Jia,
  • Shijie Zhang,
  • Lin Zhu,
  • Ning Li,
  • Fang Wang,
  • Longjian Zhang

摘要

The morphology, size, and distribution of second phases, such as α-Al, eutectic Si, and Mg2Si, are crucial to enhance the mechanical properties of as-cast Al-Si-Mg alloys. The microstructure of Al-Si-Mg alloys was regulated by a ZrCu-based amorphous alloy, and analyzed by optical microscopy (OM) and scanning electron microscopy (SEM), and the influence of the content of regulator, regulation time, and heat treatment on the microstructure evolution was studied. The results show that ZrCu-based amorphous alloys can refine α-Al grains and promote the refinement and morphology change of eutectic Si. When the content of amorphous alloy regulator was 0.1 wt.% and the regulation time was 10 min, the α-Al dendrites were significantly refined, the average size was 23.49 μm, and the distribution was equiaxial or nearly spherical. The eutectic Si structure was uniformly dispersed, and the average size and length–width ratio were 3.48 μm and 2.5 μm, respectively. After heat treatment, the length–width ratio of eutectic Si decreased from 2.5 to 2.1, and the grain size of the second-phase Mg2Si decreased and the distribution was more uniform.