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<p>This study aimed to optimize the microstructural evolution of CuSn10P1 alloy during semi-solid processing by employing the pre-annealing cold-rolling and remelting strain-induced melting activation (CRITSIMA) method. Two semi-solid samples prepared using this method were compared with samples fabricated through conventional rolling and isothermal heat treatment of cast billets. The microstructural evolution during isothermal treatment was systematically analyzed to elucidate the influence of temperature and deformation history on grain morphology. The results reveal that temperature predominantly governs grain growth, while extended isothermal holding promotes grain coarsening, rounding, and reduced size uniformity. Among the tested conditions, the semi-solid sample subjected to the annealed—45% condition followed by isothermal treatment for 5&#xa0;min exhibited the most favorable microstructure, characterized by an average grain size reduction of approximately 10% and a dihedral angle of 31.48°, indicating enhanced spheroidization and uniformity. This improvement is attributed to the lower dihedral angle produced under the annealed—45% condition, which accelerates liquid-phase penetration along grain boundaries, thereby promoting faster grain spheroidization and a more homogeneous distribution of the liquid phase.</p>

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Microstructure evolution of CuSn10P1 semi-solid slurry prepared by pre-annealing cold-rolling and remelting strain-induced melting activation method

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Yang Tao,
  • Chengxin Li,
  • Hao Chen,
  • Zhen Sun,
  • Han Xiao

摘要

This study aimed to optimize the microstructural evolution of CuSn10P1 alloy during semi-solid processing by employing the pre-annealing cold-rolling and remelting strain-induced melting activation (CRITSIMA) method. Two semi-solid samples prepared using this method were compared with samples fabricated through conventional rolling and isothermal heat treatment of cast billets. The microstructural evolution during isothermal treatment was systematically analyzed to elucidate the influence of temperature and deformation history on grain morphology. The results reveal that temperature predominantly governs grain growth, while extended isothermal holding promotes grain coarsening, rounding, and reduced size uniformity. Among the tested conditions, the semi-solid sample subjected to the annealed—45% condition followed by isothermal treatment for 5 min exhibited the most favorable microstructure, characterized by an average grain size reduction of approximately 10% and a dihedral angle of 31.48°, indicating enhanced spheroidization and uniformity. This improvement is attributed to the lower dihedral angle produced under the annealed—45% condition, which accelerates liquid-phase penetration along grain boundaries, thereby promoting faster grain spheroidization and a more homogeneous distribution of the liquid phase.