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<p>To investigate the deformation behavior and microstructural evolution of extruded 7075-T6 aluminum alloy tube material during hot compression, hot compression tests were conducted using a Gleeble-3500 thermomechanical simulator. Stress-strain data were used to establish a strain-compensated Arrhenius-type constitutive equation. Based on the dynamic materials model, processing maps were developed to assess energy dissipation and flow instability under various deformation conditions. Microstructural evolution was examined using electron backscatter diffraction (EBSD), and both a critical/peak strain model and an Avrami-based dynamic recrystallization (DRX) model were constructed to describe DRX behavior. The results show that the recrystallization activation energy of the extruded 7075-T6 aluminum alloy is 124.3&#xa0;kJ/mo. The prediction error of the strain-compensated Arrhenius equation decreased from 9.09 to 4.88%, thereby improving its accuracy. Analysis of the processing maps indicates that the optimal hot-working window lies in the high-temperature and low-strain rate region, where DRX is more complete and recrystallized grains become coarser. The ratio of critical strain to peak strain is approximately 0.484, and the activation energy for DRX is 90.7&#xa0;kJ/mol. These findings provide a theoretical basis for the precision forming of 7075-T6 aluminum alloy hollow shafts by three-roll piercing rolling.</p>

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Hot Deformation Behavior and Dynamic Recrystallization Model of 7075-T6 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Wu Qingyu,
  • Shu Xuedao,
  • Chen Yusen,
  • Yan Shuyang,
  • Xu Haijie

摘要

To investigate the deformation behavior and microstructural evolution of extruded 7075-T6 aluminum alloy tube material during hot compression, hot compression tests were conducted using a Gleeble-3500 thermomechanical simulator. Stress-strain data were used to establish a strain-compensated Arrhenius-type constitutive equation. Based on the dynamic materials model, processing maps were developed to assess energy dissipation and flow instability under various deformation conditions. Microstructural evolution was examined using electron backscatter diffraction (EBSD), and both a critical/peak strain model and an Avrami-based dynamic recrystallization (DRX) model were constructed to describe DRX behavior. The results show that the recrystallization activation energy of the extruded 7075-T6 aluminum alloy is 124.3 kJ/mo. The prediction error of the strain-compensated Arrhenius equation decreased from 9.09 to 4.88%, thereby improving its accuracy. Analysis of the processing maps indicates that the optimal hot-working window lies in the high-temperature and low-strain rate region, where DRX is more complete and recrystallized grains become coarser. The ratio of critical strain to peak strain is approximately 0.484, and the activation energy for DRX is 90.7 kJ/mol. These findings provide a theoretical basis for the precision forming of 7075-T6 aluminum alloy hollow shafts by three-roll piercing rolling.