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<p>The effects of storage pool structure on microstructure uniformity and anisotropy of Mg-Gd-Y-Zn-Zr sheet processed by rotary forward extrusion (RFE) based on equivalent strain uniformity and deformation dead metal zone (DMZ) were investigated. The metal flow rate in the upper-and-lower regions of the RFE sheet is faster than the right-and-left regions, so the difference of equivalent stress and strain at different positions can be formed. The storage pool shape has an important influence on the equivalent strain uniformity, and the metal at the elliptical storage pool structure shows a more uniform strain distribution. A deformation DMZ appears at the elliptical storage pool because the high friction can restrict the flow of metal, and the shape of “storage pool and discharge slope” is adopted to avoid the appearance of a deformation DMZ. The uniformity optimization of the “storage pool and discharge slope” based on equivalent strain and DMZ is performed, and the increase of the height of the discharge slope or the distance of the discharge slope from the exit position can enhance the uniformity of the equivalent strain and reduce the influence of the DMZ. When the height of the discharge slope is 5&#xa0;mm, and the distance of the discharge slope from the exit position is 17.5&#xa0;mm, the equivalent strain distribution becomes more uniform, and there is no obvious DMZ. The experimental results show that the maximum difference of tensile strength along the extrusion direction (ED) and transverse direction (TD) is less than 6%, the maximum difference of elongation is less than 10%, and the mechanical anisotropy is almost negligible.</p>

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Influences of storage pool on strain and mechanical uniformity of Mg-Gd-Y-Zn-Zr sheet produced by rotary forward extrusion

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Zhaocan Li,
  • Jie Cui,
  • Guanyue Sun,
  • Wenchao Liu,
  • Yan Zhao

摘要

The effects of storage pool structure on microstructure uniformity and anisotropy of Mg-Gd-Y-Zn-Zr sheet processed by rotary forward extrusion (RFE) based on equivalent strain uniformity and deformation dead metal zone (DMZ) were investigated. The metal flow rate in the upper-and-lower regions of the RFE sheet is faster than the right-and-left regions, so the difference of equivalent stress and strain at different positions can be formed. The storage pool shape has an important influence on the equivalent strain uniformity, and the metal at the elliptical storage pool structure shows a more uniform strain distribution. A deformation DMZ appears at the elliptical storage pool because the high friction can restrict the flow of metal, and the shape of “storage pool and discharge slope” is adopted to avoid the appearance of a deformation DMZ. The uniformity optimization of the “storage pool and discharge slope” based on equivalent strain and DMZ is performed, and the increase of the height of the discharge slope or the distance of the discharge slope from the exit position can enhance the uniformity of the equivalent strain and reduce the influence of the DMZ. When the height of the discharge slope is 5 mm, and the distance of the discharge slope from the exit position is 17.5 mm, the equivalent strain distribution becomes more uniform, and there is no obvious DMZ. The experimental results show that the maximum difference of tensile strength along the extrusion direction (ED) and transverse direction (TD) is less than 6%, the maximum difference of elongation is less than 10%, and the mechanical anisotropy is almost negligible.