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<p>The present work systematically optimized the heat treatment technology of Mg–9Gd–1.5Zn–0.8Al (wt.%) alloy through OM, SEM, XRD, and EDS characterization, and investigated the effects of solution-aging synergistic regulation on microstructural evolution and mechanical property enhancement mechanisms. The experiments confirm the optimal heat treatment technology as 510 °C × 10&#xa0;h solution + 225 °C × 10&#xa0;h aging. The solid solution stage regulates the distribution of the Al<sub>2</sub>Gd strengthening phase, with preferential grain boundary nucleation suppressing coarsening via pinning effects. The aging stage induces solute atom segregation that promotes precipitation of Mg<sub>5</sub>Gd phases and the lamellar long-period stacking ordered (LPSO) phase, which synergistically enhance mechanical properties through a combination of the Orowan mechanism and grain boundary pinning effects, thereby overcoming the conventional strength–ductility inverse relationship in magnesium alloys.</p>

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Effect of Heat Treatment on Microstructure and Mechanical Properties of Mg–9Gd–1.5Zn–0.8Al Alloy

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Senhao Li,
  • Jun Chen,
  • Quanan Li,
  • Xiaoya Chen,
  • Xikuan Guo,
  • Panpan Li

摘要

The present work systematically optimized the heat treatment technology of Mg–9Gd–1.5Zn–0.8Al (wt.%) alloy through OM, SEM, XRD, and EDS characterization, and investigated the effects of solution-aging synergistic regulation on microstructural evolution and mechanical property enhancement mechanisms. The experiments confirm the optimal heat treatment technology as 510 °C × 10 h solution + 225 °C × 10 h aging. The solid solution stage regulates the distribution of the Al2Gd strengthening phase, with preferential grain boundary nucleation suppressing coarsening via pinning effects. The aging stage induces solute atom segregation that promotes precipitation of Mg5Gd phases and the lamellar long-period stacking ordered (LPSO) phase, which synergistically enhance mechanical properties through a combination of the Orowan mechanism and grain boundary pinning effects, thereby overcoming the conventional strength–ductility inverse relationship in magnesium alloys.