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<p>Electrically assisted creep aging (EACA) forming significantly enhances the forming efficiency of Al-Cu-Li alloys. However, the intrinsic anisotropy of these alloys limits their high-precision formability. This study aimed to investigate the effects of electric pulses on the anisotropic behavior during the creep aging of Al-Cu-Li alloys, focusing on mechanical properties and creep strain in different orientations. Pulse currents with identical parameters were applied along 0, 45, and 90° directions to examine the directional dependence of the alloy’s behavior. The results demonstrated that EACA substantially increased both creep strain and yield strength, with noticeable anisotropy. The non-thermal effects of electric pulses led to creep strain increases of 0.041%, 0.104%, and 0.12% in the 0° (D0), 45° (D45), and 90° (D90) directions, respectively, while yield strengths increased by 21, 31, and 39&#xa0;MPa. Conversely, elongation decreased by 2.2, 1.56, and 2.66%, respectively. The electron wind effect enhanced atomic diffusion, reduced dislocation motion resistance, and decreased deformation activation energy, promoting increased creep strain. Variations in grain boundary density across orientations resulted in inconsistent electric current effects, contributing to increased anisotropy in creep strain. Furthermore, the enhanced precipitation of the T<sub>1</sub> phase during electric pulse assistance reduced the yield strength anisotropy. This study provides valuable insights into the anisotropic behavior of Al-Cu-Li alloys during EACA and its underlying mechanisms.</p>

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Effects of Electropulsing on Anisotropy in Creep Aging of Al-Cu-Li Alloy

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Shengmeng Hui,
  • Lihua Zhan,
  • Liqing Liao,
  • Yongqian Xu,
  • Bolin Ma

摘要

Electrically assisted creep aging (EACA) forming significantly enhances the forming efficiency of Al-Cu-Li alloys. However, the intrinsic anisotropy of these alloys limits their high-precision formability. This study aimed to investigate the effects of electric pulses on the anisotropic behavior during the creep aging of Al-Cu-Li alloys, focusing on mechanical properties and creep strain in different orientations. Pulse currents with identical parameters were applied along 0, 45, and 90° directions to examine the directional dependence of the alloy’s behavior. The results demonstrated that EACA substantially increased both creep strain and yield strength, with noticeable anisotropy. The non-thermal effects of electric pulses led to creep strain increases of 0.041%, 0.104%, and 0.12% in the 0° (D0), 45° (D45), and 90° (D90) directions, respectively, while yield strengths increased by 21, 31, and 39 MPa. Conversely, elongation decreased by 2.2, 1.56, and 2.66%, respectively. The electron wind effect enhanced atomic diffusion, reduced dislocation motion resistance, and decreased deformation activation energy, promoting increased creep strain. Variations in grain boundary density across orientations resulted in inconsistent electric current effects, contributing to increased anisotropy in creep strain. Furthermore, the enhanced precipitation of the T1 phase during electric pulse assistance reduced the yield strength anisotropy. This study provides valuable insights into the anisotropic behavior of Al-Cu-Li alloys during EACA and its underlying mechanisms.