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<p>Hot deformation behavior of the Al<sub>2</sub>O<sub>3</sub>/Al composite is critical yet insufficiently understood for applications requiring both strength and thermal stability. This study systematically decouples the coupled effects of strain rate (0.001–1&#xa0;s<sup>−1</sup>) and temperature (300–550&#xa0;°C) through an integration of constitutive modeling and multiscale microstructural analysis. By developing the Arrhenius constitutive equation, an unusually high activation energy (Q = 276.6 kJ/mol), attributed to Al<sub>2</sub>O<sub>3</sub> particle-induced dislocation pinning effects as confirmed by EBSD and TEM, was revealed. It is shown that the optimal processing window for the Al<sub>2</sub>O<sub>3</sub>/Al composite occurs at 550&#xa0;°C with a strain rate of 1 s<sup>−1</sup>, according to the highest power dissipation coefficient and a high proportion of dynamic recrystallization grains. These findings provide actionable guidelines for manufacturing high-integrity Al<sub>2</sub>O<sub>3</sub>/Al components, with direct relevance to the application of next-generation lightweight components in the field of nuclear and aerospace industries.</p>

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A constitutive and microstructural study for optimizing the Al2O3/Al composite in hot forming processes

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • B. M. Shi,
  • X. Bian,
  • Y. N. Zan,
  • D. Wang,
  • Q. Z. Wang,
  • B. L. Xiao,
  • Z. Y. Ma

摘要

Hot deformation behavior of the Al2O3/Al composite is critical yet insufficiently understood for applications requiring both strength and thermal stability. This study systematically decouples the coupled effects of strain rate (0.001–1 s−1) and temperature (300–550 °C) through an integration of constitutive modeling and multiscale microstructural analysis. By developing the Arrhenius constitutive equation, an unusually high activation energy (Q = 276.6 kJ/mol), attributed to Al2O3 particle-induced dislocation pinning effects as confirmed by EBSD and TEM, was revealed. It is shown that the optimal processing window for the Al2O3/Al composite occurs at 550 °C with a strain rate of 1 s−1, according to the highest power dissipation coefficient and a high proportion of dynamic recrystallization grains. These findings provide actionable guidelines for manufacturing high-integrity Al2O3/Al components, with direct relevance to the application of next-generation lightweight components in the field of nuclear and aerospace industries.