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<p>Aluminum foil stock produced by twin-roll casting (TRC) often exhibits inconsistent quality, non-uniform microstructures, and insufficiently optimized process control during cold rolling and annealing, which result in low yield and poor surface quality in the final foil. In this study, TRC AA8011 aluminum alloy was subjected to 73% cold rolling followed by annealing at 470-560 °C for 3 h to investigate its microstructural evolution and mechanical properties. Cold rolling refined the grains, increased dislocation density, and fragmented coarse intermetallics, while subsequent annealing induced complete recrystallization, with grain size and particle distribution strongly dependent on temperature. The alloy annealed at 530 °C exhibited the finest recrystallized grains (≈37 μm) and a uniform dispersion of β-AlFeSi particles, resulting in the optimal balance of strength and ductility (111.2 MPa, 34.2%). These superior properties primarily originate from grain boundary strengthening and second-phase particle. The findings provide both theoretical insights and practical guidelines for improving microstructural homogeneity and optimizing the performance of TRC 8011 aluminum foil stock.</p>

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Regulating the Microstructure and Mechanical Properties of Twin-Roll Casting AA8011 Aluminum Alloy via Cold Rolling and Annealing

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Xuefan Pan,
  • Zhiping Pu,
  • Zunyan Xu,
  • Li Fu,
  • Liyuan Liu,
  • Qiong Lu,
  • Yiren Wang,
  • Ruijiao Jia,
  • Bingheng Yu,
  • Jianwu Dong,
  • Caiju Li

摘要

Aluminum foil stock produced by twin-roll casting (TRC) often exhibits inconsistent quality, non-uniform microstructures, and insufficiently optimized process control during cold rolling and annealing, which result in low yield and poor surface quality in the final foil. In this study, TRC AA8011 aluminum alloy was subjected to 73% cold rolling followed by annealing at 470-560 °C for 3 h to investigate its microstructural evolution and mechanical properties. Cold rolling refined the grains, increased dislocation density, and fragmented coarse intermetallics, while subsequent annealing induced complete recrystallization, with grain size and particle distribution strongly dependent on temperature. The alloy annealed at 530 °C exhibited the finest recrystallized grains (≈37 μm) and a uniform dispersion of β-AlFeSi particles, resulting in the optimal balance of strength and ductility (111.2 MPa, 34.2%). These superior properties primarily originate from grain boundary strengthening and second-phase particle. The findings provide both theoretical insights and practical guidelines for improving microstructural homogeneity and optimizing the performance of TRC 8011 aluminum foil stock.