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<p>The microstructure and high-temperature tensile properties of high-pressure die-cast (HPDC) Al-Si-Mg alloys, augmented with Mn and Zr additions, have been systematically characterized and analyzed. In comparison to the baseline alloy devoid of Mn and Zr, the optimized Al-9.5Si-0.2&#xa0;Mg-0.8Mn-0.3Zr alloy demonstrated remarkable enhancements in mechanical performance at an elevated temperature of 250°C. Specifically, it exhibited a substantial 24.90% increase in ultimate tensile strength, reaching 176.35&#xa0;MPa, and a pronounced 40.70% improvement in elongation, attaining 8.33%. These superior attributes are primarily ascribed to the Mn-induced morphological transformation of the deleterious iron-rich phase, transitioning from a brittle, needle-like structure to a more robust, blocky α-AlFeMnSi phase. Concurrently, this phase undergoes a crystallographic evolution from a monoclinic to a thermodynamically stable cubic configuration. Furthermore, the incorporation of Zr facilitates the precipitation of thermally stable, short, rod-shaped AlZrSi phases, which exhibit exceptional resistance to coarsening under high-temperature tensile deformation. These phases effectively impede dislocation mobility, thereby significantly bolstering the alloy’s mechanical integrity and performance at elevated temperatures.</p>

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Microstructural Evolution and High-Temperature Performance of High-Pressure Die-Cast Al-Si-Mg Alloys Through Mn and Zr Alloying

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Yao Wang,
  • Xingchuan Xia,
  • Jiangbo Wang,
  • Wenshu Qi,
  • Chong Li,
  • Jian Ding,
  • Yongchang Liu

摘要

The microstructure and high-temperature tensile properties of high-pressure die-cast (HPDC) Al-Si-Mg alloys, augmented with Mn and Zr additions, have been systematically characterized and analyzed. In comparison to the baseline alloy devoid of Mn and Zr, the optimized Al-9.5Si-0.2 Mg-0.8Mn-0.3Zr alloy demonstrated remarkable enhancements in mechanical performance at an elevated temperature of 250°C. Specifically, it exhibited a substantial 24.90% increase in ultimate tensile strength, reaching 176.35 MPa, and a pronounced 40.70% improvement in elongation, attaining 8.33%. These superior attributes are primarily ascribed to the Mn-induced morphological transformation of the deleterious iron-rich phase, transitioning from a brittle, needle-like structure to a more robust, blocky α-AlFeMnSi phase. Concurrently, this phase undergoes a crystallographic evolution from a monoclinic to a thermodynamically stable cubic configuration. Furthermore, the incorporation of Zr facilitates the precipitation of thermally stable, short, rod-shaped AlZrSi phases, which exhibit exceptional resistance to coarsening under high-temperature tensile deformation. These phases effectively impede dislocation mobility, thereby significantly bolstering the alloy’s mechanical integrity and performance at elevated temperatures.