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<p>The evolution of the physical field, DRX and average grain size during the backward extrusion process of AZ80 magnesium alloy wheels by different extrusion speeds was analyzed in this study. As the extrusion speed increases (1-7&#xa0;mm/s), the overall deformation heat of the wheel increases. The temperature at the bottom of the wheel is higher than that at the rim at low extrusion speeds (&lt;3&#xa0;mm/s), and the temperature at the rim is gradually higher than that at the bottom of the wheel as the extrusion speed increases (&gt;3&#xa0;mm/s). Increasing extrusion speed can reduce the tonnage required for wheel forming without increasing the damage factor at the upper rim, i.e. without increasing the tendency to crack at the upper rim. The increase in extrusion speed has a small effect on the DRX volume fraction in each part of the wheel. Excessively high extrusion speeds (&gt;5&#xa0;mm/s) can lead to grain growth due to deformation heat, while excessively low extrusion speeds (1&#xa0;mm/s) can lead to grain growth due to longer holding times. The process window for the wheel forming speed can be set to 3 ~ 5&#xa0;mm/s, when the overall microstructure of the wheel is refined.</p>

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Effect of Extrusion Speed on Backward Extrusion Process of Magnesium Alloy Wheel

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Qiyu Liao,
  • Yanchao Jiang,
  • Qichi Le

摘要

The evolution of the physical field, DRX and average grain size during the backward extrusion process of AZ80 magnesium alloy wheels by different extrusion speeds was analyzed in this study. As the extrusion speed increases (1-7 mm/s), the overall deformation heat of the wheel increases. The temperature at the bottom of the wheel is higher than that at the rim at low extrusion speeds (<3 mm/s), and the temperature at the rim is gradually higher than that at the bottom of the wheel as the extrusion speed increases (>3 mm/s). Increasing extrusion speed can reduce the tonnage required for wheel forming without increasing the damage factor at the upper rim, i.e. without increasing the tendency to crack at the upper rim. The increase in extrusion speed has a small effect on the DRX volume fraction in each part of the wheel. Excessively high extrusion speeds (>5 mm/s) can lead to grain growth due to deformation heat, while excessively low extrusion speeds (1 mm/s) can lead to grain growth due to longer holding times. The process window for the wheel forming speed can be set to 3 ~ 5 mm/s, when the overall microstructure of the wheel is refined.