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<p>This study aims to optimize the deformation and annealing processes for Al–Cu–Mg alloys, particularly the 2024 aluminum alloy, which has wide applications in aerospace, automotive, and other industries due to its excellent mechanical properties and corrosion resistance. The alloy was annealed at 260 ℃, 320 ℃, and 420 ℃ for 2 hours after 90% cold-rolling deformation. Using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD), transmission electron microscope (TEM), the study found that as the annealing temperature increased, the proportion of low-angle grain boundaries (2–15°, LAGB) decreased, while that of high-angle grain boundaries (&gt;15°, HAGB) increased. With higher recrystallization, the alloy’s strength and hardness decreased, but its plasticity and toughness improved. The texture weakens, following an evolution path of Brass + Copper → R-Cu + m-Brass + Cu<sub>35°</sub> + α<sub>55°</sub> + {101} &lt; 232 &gt;  → P<sub>0°</sub> + Goss → V + F. Additionally, the volume fraction of Σ3 coincidence site lattice (CSL) grain boundaries increased, enhancing corrosion resistance.</p>

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Influence of Annealing Temperature on the Microstructure and Properties of Large Deformation 2024 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Haigen Jian,
  • Wu Fang,
  • Jiangyao Wu,
  • Jiarong Chen,
  • Miao Chen

摘要

This study aims to optimize the deformation and annealing processes for Al–Cu–Mg alloys, particularly the 2024 aluminum alloy, which has wide applications in aerospace, automotive, and other industries due to its excellent mechanical properties and corrosion resistance. The alloy was annealed at 260 ℃, 320 ℃, and 420 ℃ for 2 hours after 90% cold-rolling deformation. Using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD), transmission electron microscope (TEM), the study found that as the annealing temperature increased, the proportion of low-angle grain boundaries (2–15°, LAGB) decreased, while that of high-angle grain boundaries (>15°, HAGB) increased. With higher recrystallization, the alloy’s strength and hardness decreased, but its plasticity and toughness improved. The texture weakens, following an evolution path of Brass + Copper → R-Cu + m-Brass + Cu35° + α55° + {101} < 232 >  → P0° + Goss → V + F. Additionally, the volume fraction of Σ3 coincidence site lattice (CSL) grain boundaries increased, enhancing corrosion resistance.