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<p>The isothermal uniaxial hot compression experiments were carried out on the Mg-4Sm-3Gd-0.9Al alloy after solution treatment. The strain-compensated constitutive equation and hot processing maps were established. The effects of Al<sub>2</sub>RE phase on the formation of recrystallized grains were studied. The results showed that the average grain size of the alloy was 27.89&#xa0;μm and the microstructure was mainly composed of α-Mg matrix and uniformly distributed second phase (Al<sub>2</sub>RE, RE = Sm and Gd) before hot deformation. After hot compression, true stress-strain curves showed significant dynamic recrystallization characteristics and Al<sub>2</sub>RE phase reduced the peak stress of the alloy. The stress-strain curves predicted by the strain-compensated constitutive equation showed good agreement with the experimental results. The optimal processing parameters of the alloy were obtained as <i>T</i> = 440&#xa0;°C and <i>ɛ̇</i> = 0.01&#xa0;s<sup>−1</sup>. The Particle Stimulated Nucleation (PSN) mechanism triggered by the Al<sub>2</sub>RE phase significantly promotes the formation of dynamic recrystallization. This not only reduces workability temperature but also inhibits grain growth, thereby effectively enhancing plastic deformation capacity.</p>

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Effect of Al2RE Phase on Hot Deformation Behavior of Mg-4Sm-3Gd-0.9Al Alloy

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Junyong Wang,
  • Lingtong Zhu,
  • Qing Zhang,
  • Ping Li

摘要

The isothermal uniaxial hot compression experiments were carried out on the Mg-4Sm-3Gd-0.9Al alloy after solution treatment. The strain-compensated constitutive equation and hot processing maps were established. The effects of Al2RE phase on the formation of recrystallized grains were studied. The results showed that the average grain size of the alloy was 27.89 μm and the microstructure was mainly composed of α-Mg matrix and uniformly distributed second phase (Al2RE, RE = Sm and Gd) before hot deformation. After hot compression, true stress-strain curves showed significant dynamic recrystallization characteristics and Al2RE phase reduced the peak stress of the alloy. The stress-strain curves predicted by the strain-compensated constitutive equation showed good agreement with the experimental results. The optimal processing parameters of the alloy were obtained as T = 440 °C and ɛ̇ = 0.01 s−1. The Particle Stimulated Nucleation (PSN) mechanism triggered by the Al2RE phase significantly promotes the formation of dynamic recrystallization. This not only reduces workability temperature but also inhibits grain growth, thereby effectively enhancing plastic deformation capacity.