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<p>This study investigates the high-temperature tensile behavior of AZ31 magnesium alloy under varying current intensities and directions. At 350&#xa0;°C, with a strain rate of 1 × 10⁻<sup>3</sup>&#xa0;s⁻<sup>1</sup> and a peak current density of 50 A/mm<sup>2</sup>, the alloy demonstrates enhanced superplasticity, increasing its true strain at fracture from 0.88 to 1.23. The height-to-diameter ratio of the expanded region improves from 0.45 (without current) to 0.56 under a two-dimensional current field. SEM, EBSD, and TEM analyses reveal that a favourably oriented pulsed current enhances dislocation mobility, facilitates grain boundary sliding and rotation, and promotes recrystallization, contributing to grain refinement.</p>

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Study on the effect of pulse current and its direction on superplastic deformation of AZ31 Magnesium alloy

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Hongzhe Wu,
  • Chao Li,
  • Zishuai Chen,
  • Yihan Gao

摘要

This study investigates the high-temperature tensile behavior of AZ31 magnesium alloy under varying current intensities and directions. At 350 °C, with a strain rate of 1 × 10⁻3 s⁻1 and a peak current density of 50 A/mm2, the alloy demonstrates enhanced superplasticity, increasing its true strain at fracture from 0.88 to 1.23. The height-to-diameter ratio of the expanded region improves from 0.45 (without current) to 0.56 under a two-dimensional current field. SEM, EBSD, and TEM analyses reveal that a favourably oriented pulsed current enhances dislocation mobility, facilitates grain boundary sliding and rotation, and promotes recrystallization, contributing to grain refinement.