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<p>Based on hot compression experiments and grain growth experiments of 6063 aluminum alloy, this study established a microstructure model for 6063 aluminum alloy. The accuracy of the developed model was verified by embedding it into hot compression numerical simulations through subroutine secondary development. Subsequently, the microstructure model was applied to the porthole die extrusion of complex cross-sectional profiles to investigate microstructure evolution during profile formation and analyze the influence of process parameters on microstructure. The results demonstrate that the established microstructure model can accurately predict the microstructural evolution of 6063 aluminum alloy during hot deformation. The results indicate that the established microstructure model can accurately predict the microstructure of the 6063 aluminum alloy. During the porthole die extrusion of complex cross-sections, the dynamic recrystallization (DRX) volume fractions from the surface to the interior of the profile are 92.44%, 73.03%, and 66.11%, respectively, with grain sizes of 28.57&#xa0;μm, 42.80&#xa0;μm, and 47.92&#xa0;μm. At the welds, the DRX volume fraction is 97.67%, and the grain size is 29.49&#xa0;μm. As the billet temperature increases from 490 to 540&#xa0;°C, the average DRX volume fraction of the profile cross-section increases from 81% to 83.9%, and the average grain size increases from 37.39 to 38.67&#xa0;μm. When the ram speed decreases from 4 to 0.4&#xa0;mm/s, the average DRX volume fraction increases from 81% to 82.57%, and the average grain size increases from 37.39 to 41.88&#xa0;μm. As the extrusion ratio decreases from 61.66 to 44.57, the average DRX volume fraction decreases from 81% to 79.09%, and the average grain size increases from 37.39 to 38.45&#xa0;μm. This research provides theoretical guidance at the microstructural level for the production of aluminum alloy profiles.</p>

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Microstructure evolution of 6063 aluminum alloy thin-walled hollow complex cross-section profile by porthole die extrusion forming

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Zheng Ma,
  • Xuedao Shu,
  • Haijie Xu,
  • Zixuan Li,
  • Sheng Xu,
  • Zuojun Fan

摘要

Based on hot compression experiments and grain growth experiments of 6063 aluminum alloy, this study established a microstructure model for 6063 aluminum alloy. The accuracy of the developed model was verified by embedding it into hot compression numerical simulations through subroutine secondary development. Subsequently, the microstructure model was applied to the porthole die extrusion of complex cross-sectional profiles to investigate microstructure evolution during profile formation and analyze the influence of process parameters on microstructure. The results demonstrate that the established microstructure model can accurately predict the microstructural evolution of 6063 aluminum alloy during hot deformation. The results indicate that the established microstructure model can accurately predict the microstructure of the 6063 aluminum alloy. During the porthole die extrusion of complex cross-sections, the dynamic recrystallization (DRX) volume fractions from the surface to the interior of the profile are 92.44%, 73.03%, and 66.11%, respectively, with grain sizes of 28.57 μm, 42.80 μm, and 47.92 μm. At the welds, the DRX volume fraction is 97.67%, and the grain size is 29.49 μm. As the billet temperature increases from 490 to 540 °C, the average DRX volume fraction of the profile cross-section increases from 81% to 83.9%, and the average grain size increases from 37.39 to 38.67 μm. When the ram speed decreases from 4 to 0.4 mm/s, the average DRX volume fraction increases from 81% to 82.57%, and the average grain size increases from 37.39 to 41.88 μm. As the extrusion ratio decreases from 61.66 to 44.57, the average DRX volume fraction decreases from 81% to 79.09%, and the average grain size increases from 37.39 to 38.45 μm. This research provides theoretical guidance at the microstructural level for the production of aluminum alloy profiles.