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<p>This study systematically investigates the effects of hot drawing speed (1.5&#xa0;m/min to 3.5&#xa0;m/min) on the microstructure and mechanical properties of Mg-9.5Gd-3.5Y-1Zn-0.3Zr alloy wires. Results show that a higher drawing speed intensifies the thermo-mechanical coupling effect, which uniformly fragments and disperses the long-period stacking ordered (LPSO) phase throughout the matrix. This process further refines dynamic recrystallized grains, reducing the average matrix grain size from 13.11 to 6.26&#xa0;μm in the final 1.4-mm-diameter wire. Moreover, the increased speed shortens the high-temperature exposure time, keeping the wire temperature below the dissolution point of Mg<sub>5</sub>(Gd,Y)(Mg<sub>5</sub>RE) and thereby suppressing its solid solution. Consequently, the Mg<sub>5</sub>RE phase remains as a high-density dispersion in the matrix. These microstructural improvements lead to a significant increase in ultimate tensile strength (from 428 to 536&#xa0;MPa) and yield strength (from 401 to 514&#xa0;MPa). The strengthening mechanisms are attributed to: (1) improved distribution and aspect ratio of the LPSO phase, which inhibits grain coarsening; and (2) a strong pinning effect induced by the uniformly dispersed Mg<sub>5</sub>RE precipitates, which stabilizes the fine-grained structure and promotes the formation of high-density dislocation substructures, resulting in synergistic strengthening.</p>

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Effect of Hot Drawing Speed on Microstructure and Mechanical Properties of Mg-Gd-Y-Zn-Zr Alloy Wires

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Xin Tao,
  • Liqing Wang,
  • Yunlong Li,
  • Kai Ma,
  • Dongdong Zhang,
  • Zhen Zhang,
  • Zhanyong Zhao,
  • Peikang Bai,
  • Fude Wang

摘要

This study systematically investigates the effects of hot drawing speed (1.5 m/min to 3.5 m/min) on the microstructure and mechanical properties of Mg-9.5Gd-3.5Y-1Zn-0.3Zr alloy wires. Results show that a higher drawing speed intensifies the thermo-mechanical coupling effect, which uniformly fragments and disperses the long-period stacking ordered (LPSO) phase throughout the matrix. This process further refines dynamic recrystallized grains, reducing the average matrix grain size from 13.11 to 6.26 μm in the final 1.4-mm-diameter wire. Moreover, the increased speed shortens the high-temperature exposure time, keeping the wire temperature below the dissolution point of Mg5(Gd,Y)(Mg5RE) and thereby suppressing its solid solution. Consequently, the Mg5RE phase remains as a high-density dispersion in the matrix. These microstructural improvements lead to a significant increase in ultimate tensile strength (from 428 to 536 MPa) and yield strength (from 401 to 514 MPa). The strengthening mechanisms are attributed to: (1) improved distribution and aspect ratio of the LPSO phase, which inhibits grain coarsening; and (2) a strong pinning effect induced by the uniformly dispersed Mg5RE precipitates, which stabilizes the fine-grained structure and promotes the formation of high-density dislocation substructures, resulting in synergistic strengthening.