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Flow Behavior and Activation Energy Evolution of 7075-T6 Al Alloy During Hot Deformation

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Abstract

In this paper, the hot deformation behavior of 7075-T6 aluminum alloy was studied by hot compression experiments. The results show that the flow stress exhibits a continuous decrease at low temperatures. At high temperatures, the flow stress exhibits a steady state. The softening at low temperatures is dominated by dynamic recovery (DRV), accompanied by coarsening of precipitates, resulting in a continuous decrease in flow stress. As the temperature increases, dynamic recrystallization (DRX) gradually strengthens, and the DRX mechanism gradually transforms from continuous dynamic recrystallization to geometric dynamic recrystallization. Compared to the strain-compensated Arrhenius-type model, the novel modified constitutive equation has a higher prediction accuracy, with a correlation coefficient as high as 0.9991 and an average relative absolute error as low as 2.0734%. The activation energy decreases with increasing temperature and strain rate. At low temperatures and low strain rates, the activation energy decreases with increasing strain but shows the opposite trend at high temperatures and high strain rates. Based on the activation energy maps, the optimum hot-working parameters for this alloy are temperature 653–733 K and strain rate 0.001–0.1 s−1.

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Acknowledgements

The authors acknowledge financial support by the Key Research & Development Program of Yunnan Province (202103AA080017 and CBN21281004A), the Major Science and Technology Project of Yunnan Province (202002AB080001-4), Yunnan Ten Thousand Talents Plan Young & Elite Talents Project (YNWR-QNBJ-2020-020) and the Innovation Team Cultivation Project of Yunnan Province (202005AE160016). The authors are also grateful to Yunnan Aluminum Co., Ltd., for providing the original materials.

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Hongbin Yang, Zhuo Qian, Peng Sun, Hongmei Yang, Shanju Zheng & Mengnie Li

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  1. Hongbin Yang
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  2. Zhuo Qian
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  3. Peng Sun
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Correspondence to Shanju Zheng or Mengnie Li.

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Yang, H., Qian, Z., Sun, P. et al. Flow Behavior and Activation Energy Evolution of 7075-T6 Al Alloy During Hot Deformation. JOM (2024). https://doi.org/10.1007/s11837-024-06567-6

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