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Refinement of Primary Si in Hypereutectic Al-Si Alloy by Serpentine Channel with Spoiler

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Abstract

The microstructure and mechanical properties of hypereutectic Ai-Si alloys prepared by serpentine channel with spoiler were investigated. The flow state of the melt during the slurry preparation by the serpentine channel was simulated. The Al-Si alloy with the spoiler was superior to that without the spoiler at identical pouring conditions. The microstructure of the hypereutectic Ai-Si alloy was composed of the primary Si and Al-Si eutectic phases. The flow direction of the alloy slurry was disorganized because of the stirring effect of the spoiler, which improved the nuclei exfoliation and spherical growth of the primary Si. The spoiler refined the primary Si grains, and enhanced the mechanical properties of the Al-Si alloy. As the pouring temperature decreased from 746 to 701 °C, the size of the primary Si grains gradually decreased, and the tensile strength of the Al-Si alloy increased. The equivalent diameter of the primary Si grains could be reduced to 21.2 μm, and the tensile strength could be increased to 298 MPa under a pouring temperature of 701 °C.

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Acknowledgment

This work was supported financially by the Scientific and Technological Project of Henan Province (212102210350), the Research Foundation for Advanced Talents of Henan University of Technology (2019BS052), and Henan Province science and technology research project (222102220018).

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou, 450001, China

    Dong Wang, Cuncai Jiang, Gangyi Cai, Jun Li, Yanbo Hui & Yonggang Guo

  2. Henan Provincial Engineering Research Centre of Automotive Composite Materials, Zhengzhou, 450001, China

    Dong Wang & Cuncai Jiang

  3. Shanghai Research Institute of Materials Co., Shanghai, 200433, China

    Fahai Ba

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  1. Dong Wang
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Correspondence to Dong Wang, Yanbo Hui or Yonggang Guo.

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Wang, D., Jiang, C., Cai, G. et al. Refinement of Primary Si in Hypereutectic Al-Si Alloy by Serpentine Channel with Spoiler. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09258-0

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  • DOI: https://doi.org/10.1007/s11665-024-09258-0

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