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<p>Analyzing the electrically-assisted stress relaxation behavior of Ti<sub>2</sub>AlNb alloy is beneficial for improving the forming accuracy of Ti<sub>2</sub>AlNb alloy thin-walled components. This study analyzes and models the deformation mechanism of Ti<sub>2</sub>AlNb alloy foils during the electrically-assisted stress relaxation process. The non-thermal effect of pulsed current on the stress relaxation of Ti<sub>2</sub>AlNb alloy foils was decoupled using forced air cooling. As the current density increases, it promotes dislocation recovery and O-phase precipitation, significantly accelerating the stress decrease in stress-driven stage I of the stress relaxation process. However, extensive precipitation of the O phase hinders dislocation movement, reducing the stress relaxation rate in stage II. A physically-based constitutive model was developed, considering the effects of pulsed current on activation energy, dislocation evolution, and phase transformation, with a relative average absolute error of 8.7%.</p>

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Analyzing and modelling the accelerated stress relaxation caused by pulsed current of Ti2AlNb alloy foils

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Jie Zhao,
  • Tianyi Gao,
  • Bao Qu,
  • Min Cui,
  • Rongfu Xu

摘要

Analyzing the electrically-assisted stress relaxation behavior of Ti2AlNb alloy is beneficial for improving the forming accuracy of Ti2AlNb alloy thin-walled components. This study analyzes and models the deformation mechanism of Ti2AlNb alloy foils during the electrically-assisted stress relaxation process. The non-thermal effect of pulsed current on the stress relaxation of Ti2AlNb alloy foils was decoupled using forced air cooling. As the current density increases, it promotes dislocation recovery and O-phase precipitation, significantly accelerating the stress decrease in stress-driven stage I of the stress relaxation process. However, extensive precipitation of the O phase hinders dislocation movement, reducing the stress relaxation rate in stage II. A physically-based constitutive model was developed, considering the effects of pulsed current on activation energy, dislocation evolution, and phase transformation, with a relative average absolute error of 8.7%.