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<p>The Mg–7Gd–5Y–1.2Nd–0.5Zr (EW75) alloy has been widely adopted in aerospace and military industries owing to its outstanding quasi-static mechanical properties. However, its inadequate dynamic mechanical performance limits broader application prospects. In this work, dynamic mechanical testing was conducted on EW75 alloy using a split Hopkinson pressure bar at a strain rate of 2200 s<sup>−1</sup>. Combined with microstructural characterization, the dynamic mechanical behavior and underlying deformation mechanisms of the alloy under different heat-treated conditions were systematically investigated. The results demonstrate that during T4 treatment, as the temperature increases, the secondary phase dissolves back into the α–Mg matrix accompanied by significant grain growth. The deterioration in dynamic mechanical properties induced by grain coarsening becomes the dominant factor, leading to a reduction in the peak stress of the alloy. Following T6 treatment with peak aging at 220 °C for 18&#xa0;h, the volume fraction of nano-scale β’ precipitates reaches its maximum. Correspondingly, the alloy achieves a hardness of 118&#xa0;N/mm<sup>2</sup> and a peak stress as high as 530&#xa0;MPa. This phenomenon is primarily attributed to the effective pinning of dislocations by the β’ precipitates, which significantly hinders their movement. Compared to other T6-treated alloys, the deformation accommodation in the peak-aged alloy not only relies on the activation of pyramidal &lt; a &gt; slip and {10<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\stackrel{\text{-}}{\text{1}}\)</EquationSource> </InlineEquation>2} tensile twinning, but also benefits from the involvement of pyramidal &lt; c + a &gt; slip, which further enhances its dynamic mechanical performance. The findings provide both theoretical foundation and experimental support for regulating the dynamic mechanical properties of rare-earth magnesium alloys through heat treatment.</p> Graphical abstract <p></p>

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Enhancing the Dynamic Mechanical Properties of Mg–Gd–Y–Nd–Zr Alloy Via Solid Solution and Aging Treatments

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Qiyuan Luan,
  • Ziqi Wei,
  • Haowei Yi,
  • Le Zhou,
  • Zhi Wang,
  • Feng Wang,
  • Xuanyu Liu,
  • Pingli Mao

摘要

The Mg–7Gd–5Y–1.2Nd–0.5Zr (EW75) alloy has been widely adopted in aerospace and military industries owing to its outstanding quasi-static mechanical properties. However, its inadequate dynamic mechanical performance limits broader application prospects. In this work, dynamic mechanical testing was conducted on EW75 alloy using a split Hopkinson pressure bar at a strain rate of 2200 s−1. Combined with microstructural characterization, the dynamic mechanical behavior and underlying deformation mechanisms of the alloy under different heat-treated conditions were systematically investigated. The results demonstrate that during T4 treatment, as the temperature increases, the secondary phase dissolves back into the α–Mg matrix accompanied by significant grain growth. The deterioration in dynamic mechanical properties induced by grain coarsening becomes the dominant factor, leading to a reduction in the peak stress of the alloy. Following T6 treatment with peak aging at 220 °C for 18 h, the volume fraction of nano-scale β’ precipitates reaches its maximum. Correspondingly, the alloy achieves a hardness of 118 N/mm2 and a peak stress as high as 530 MPa. This phenomenon is primarily attributed to the effective pinning of dislocations by the β’ precipitates, which significantly hinders their movement. Compared to other T6-treated alloys, the deformation accommodation in the peak-aged alloy not only relies on the activation of pyramidal < a > slip and {10 \(\:\stackrel{\text{-}}{\text{1}}\) 2} tensile twinning, but also benefits from the involvement of pyramidal < c + a > slip, which further enhances its dynamic mechanical performance. The findings provide both theoretical foundation and experimental support for regulating the dynamic mechanical properties of rare-earth magnesium alloys through heat treatment.

Graphical abstract