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<p>The Mg-6Gd-3Y-1.5Zn-0.6Zr rare-earth magnesium alloy was selected as the research material, and the feasibility of achieving simultaneous enhancement of strength and ductility in magnesium alloys via mechanisms including the kinking and fragmentation of long-period stacking ordered (LPSO) phases, dynamic recrystallization (DRX), and texture weakening was explored through compound extrusion. The results show that during the compound extrusion process, the LPSO phases undergo kinking and fragmentation, which enhances the particle-stimulated nucleation (PSN) effect, facilitates DRX nucleation, optimizes grain orientation, and thus contributes to improving the mechanical properties of the material. The synergistic effect of multiple slip systems markedly promotes DRX, and the optimization of basal slip and the activation of non-basal slip systems significantly enhance the ductility of the material. Mechanical property tests demonstrate that the compound extrusion specimens achieve significant improvements in both strength and ductility compared with the conventional forward extrusion specimens, with the ultimate tensile strength reaching 297.75 MPa, the yield strength 204.81 MPa, and the elongation after fracture 17.40%.</p>

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Simultaneous enhancement of strength and ductility in LPSO-containing Mg-6Gd-3Y-1.5Zn-0.6Zr alloy via compound extrusion

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Tao Huang,
  • Zhou Zou,
  • Xingjia Tu,
  • Qianhao Zang,
  • Fengjian Shi,
  • Hongmei Chen

摘要

The Mg-6Gd-3Y-1.5Zn-0.6Zr rare-earth magnesium alloy was selected as the research material, and the feasibility of achieving simultaneous enhancement of strength and ductility in magnesium alloys via mechanisms including the kinking and fragmentation of long-period stacking ordered (LPSO) phases, dynamic recrystallization (DRX), and texture weakening was explored through compound extrusion. The results show that during the compound extrusion process, the LPSO phases undergo kinking and fragmentation, which enhances the particle-stimulated nucleation (PSN) effect, facilitates DRX nucleation, optimizes grain orientation, and thus contributes to improving the mechanical properties of the material. The synergistic effect of multiple slip systems markedly promotes DRX, and the optimization of basal slip and the activation of non-basal slip systems significantly enhance the ductility of the material. Mechanical property tests demonstrate that the compound extrusion specimens achieve significant improvements in both strength and ductility compared with the conventional forward extrusion specimens, with the ultimate tensile strength reaching 297.75 MPa, the yield strength 204.81 MPa, and the elongation after fracture 17.40%.