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<p>Magnesium (Mg) alloys are promising for a wide range of applications due to their lightweight nature, excellent biocompatibility, and favorable vibration-damping properties. However, their widespread use is hindered by issues including inadequate corrosion resistance and low strength at room temperature. In this study, three extruded alloys (SZM0, SZM0.5, and SZM1) were fabricated with varying levels of Mn (0&#xa0;wt.%, 0.5&#xa0;wt.%, and 1.0&#xa0;wt.%) to a Mg-1.5Sm-1Zn matrix alloy. The results indicated that Mn addition significantly refined the grain size, promoted the dynamic recrystallization (DRX) process, and increased both the area fraction and distribution uniformity of the secondary phases. Regarding mechanical properties, Mn addition improved the tensile and compressive strengths of the alloys, with the SZM0.5 alloy exhibiting enhanced strength while retaining good tensile ductility. Visco-plastic self-consistent (VPSC) simulations confirmed that Mn addition increased the initial resistance of the slip system and that tensile deformation was dominated by basal and prismatic slip, whereas tensile twinning activity was suppressed during compression. For corrosion resistance, Mn addition shifted the corrosion potential to a more positive value and reduced the corrosion current density. It promoted the generation of MnO and MnO<sub>2</sub>, leading to improved protective properties.</p>

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Enhanced Mechanical and Corrosion Properties of As-Extruded Mg-Sm-Zn Alloy Bars via Mn Addition: Microstructure Evolution and VPSC Simulations

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Zhengyu Jiang,
  • Chao He,
  • Wenhui Zhang,
  • Tianqi Zhang,
  • Yanfu Chai,
  • Yan Zhang,
  • Dongyang Li

摘要

Magnesium (Mg) alloys are promising for a wide range of applications due to their lightweight nature, excellent biocompatibility, and favorable vibration-damping properties. However, their widespread use is hindered by issues including inadequate corrosion resistance and low strength at room temperature. In this study, three extruded alloys (SZM0, SZM0.5, and SZM1) were fabricated with varying levels of Mn (0 wt.%, 0.5 wt.%, and 1.0 wt.%) to a Mg-1.5Sm-1Zn matrix alloy. The results indicated that Mn addition significantly refined the grain size, promoted the dynamic recrystallization (DRX) process, and increased both the area fraction and distribution uniformity of the secondary phases. Regarding mechanical properties, Mn addition improved the tensile and compressive strengths of the alloys, with the SZM0.5 alloy exhibiting enhanced strength while retaining good tensile ductility. Visco-plastic self-consistent (VPSC) simulations confirmed that Mn addition increased the initial resistance of the slip system and that tensile deformation was dominated by basal and prismatic slip, whereas tensile twinning activity was suppressed during compression. For corrosion resistance, Mn addition shifted the corrosion potential to a more positive value and reduced the corrosion current density. It promoted the generation of MnO and MnO2, leading to improved protective properties.