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<p>This paper studies the dynamic recrystallization (DRX) behavior and hot workability of Mg-9Gd-1.5Zn-0.8Sn alloys via hot compression tests. Conducted on a Gleeble-1500D thermal simulator, the tests cover deformation temperatures of 370–490&#xa0;°C and strain rates of 0.002–1&#xa0;s<sup>-1</sup>. The research establishes a DRX critical strain model (based on the inflection of the work hardening rate curve), a DRX kinetic model (using the Avrami equation), and processing maps (derived from the dynamic material model). By integrating these maps with microstructural evolution observations, it identifies instability mechanisms and optimal hot-working regions. Results show that critical strain (ε<sub>c</sub>) declines with higher temperatures or lower strain rates—conditions that facilitate DRX. Thus, the recommended effective hot-working range is 400–470&#xa0;°C for temperature and 0.002–0.05&#xa0;s<sup>-1</sup> for strain rate.</p> Graphical abstract <p></p> <p>This paper systematically investigates the dynamic recrystallization behavior (DRX) and hot workability of Mg-9Gd-1.5Zn-0.8Sn alloys using a hot compression experimental system. The experiment was conducted using a Gleeble-1500D thermal simulator, which can generate deformation temperatures ranging from 370 to 490 °C and strain rates ranging from 0.002 to 1 s<sup>-1</sup>. The results indicate that the stress–strain curves exhibit a single-peak DRX behavior. The DRX critical strain model of the alloy is constructed according to the inflection characteristics of the work hardening rate curve. The DRX kinetic model is constructed in accord with the Avrami equation. The processing maps are derived from the dynamic material model. The instability mechanisms of these regions are investigated by combining the processing map and the microstructural evolution, and the most suitable regions for hot working are identified. It has been demonstrated that the critical strain εc of the alloy is reduced at higher deformation temperatures or lower strain rates, and that the DRX occurs more easily under these conditions. Therefore, the material is more suitable for hot working. The range of temperatures and strain rates that have been identified to be conducive to the effective hot working of the Mg-9Gd-1.5Zn-0.8Sn alloy include temperatures ranging from 400 to 470 °C and strain rates ranging from 0.002 to 0.05 s<sup>-1</sup>.</p>

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Establishment of Dynamic Recrystallization Critical Strain Model,Kinetic Model and Hot Workability Analysis for Mg-9Gd-1.5Zn-0.8Sn Alloy

  • 期刊论文

  • 发表日期：

    2025年11月28日

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

摘要

This paper studies the dynamic recrystallization (DRX) behavior and hot workability of Mg-9Gd-1.5Zn-0.8Sn alloys via hot compression tests. Conducted on a Gleeble-1500D thermal simulator, the tests cover deformation temperatures of 370–490 °C and strain rates of 0.002–1 s-1. The research establishes a DRX critical strain model (based on the inflection of the work hardening rate curve), a DRX kinetic model (using the Avrami equation), and processing maps (derived from the dynamic material model). By integrating these maps with microstructural evolution observations, it identifies instability mechanisms and optimal hot-working regions. Results show that critical strain (εc) declines with higher temperatures or lower strain rates—conditions that facilitate DRX. Thus, the recommended effective hot-working range is 400–470 °C for temperature and 0.002–0.05 s-1 for strain rate.

Graphical abstract

This paper systematically investigates the dynamic recrystallization behavior (DRX) and hot workability of Mg-9Gd-1.5Zn-0.8Sn alloys using a hot compression experimental system. The experiment was conducted using a Gleeble-1500D thermal simulator, which can generate deformation temperatures ranging from 370 to 490 °C and strain rates ranging from 0.002 to 1 s-1. The results indicate that the stress–strain curves exhibit a single-peak DRX behavior. The DRX critical strain model of the alloy is constructed according to the inflection characteristics of the work hardening rate curve. The DRX kinetic model is constructed in accord with the Avrami equation. The processing maps are derived from the dynamic material model. The instability mechanisms of these regions are investigated by combining the processing map and the microstructural evolution, and the most suitable regions for hot working are identified. It has been demonstrated that the critical strain εc of the alloy is reduced at higher deformation temperatures or lower strain rates, and that the DRX occurs more easily under these conditions. Therefore, the material is more suitable for hot working. The range of temperatures and strain rates that have been identified to be conducive to the effective hot working of the Mg-9Gd-1.5Zn-0.8Sn alloy include temperatures ranging from 400 to 470 °C and strain rates ranging from 0.002 to 0.05 s-1.