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<p>Hot workability and dynamic restoration have been studied in WE rare earth magnesium (Mg-RE) alloys with and without the addition of samarium (Sm) elements. Results show that the Mg-RE alloy with Sm addition is more stable during hot deformation, while the Mg-RE alloy without Sm fractures earlier at low temperature and high strain rates (350&#xa0;°C/0.1 ~ 1&#xa0;s<sup>−1</sup>). Meanwhile, the overall hot workability has also been improved by the Sm addition. In microstructure evolution, a new processing parameter with relatively lower temperature (450&#xa0;°C/0.001&#xa0;s<sup>−1</sup>) for complete dynamic recrystallization (DRX) has been observed in the alloy with Sm addition, and the average grain size (19.6&#xa0;μm) is the finest among all cases of complete DRX. In terms of DRX mechanism, the addition of Sm significantly refines the initial grains, resulting in higher substructure density formed in the subsequent hot deformation, which thus accelerates the DRX kinetics.</p>

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Accelerating Thermal Restoration Kinetics and Dynamic Recrystallization of a Magnesium-Rare Earth Alloy by Addition of Samarium Element

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Yunwei Gui,
  • Yingying Li,
  • Lingxiao Ouyang,
  • Quanan Li

摘要

Hot workability and dynamic restoration have been studied in WE rare earth magnesium (Mg-RE) alloys with and without the addition of samarium (Sm) elements. Results show that the Mg-RE alloy with Sm addition is more stable during hot deformation, while the Mg-RE alloy without Sm fractures earlier at low temperature and high strain rates (350 °C/0.1 ~ 1 s−1). Meanwhile, the overall hot workability has also been improved by the Sm addition. In microstructure evolution, a new processing parameter with relatively lower temperature (450 °C/0.001 s−1) for complete dynamic recrystallization (DRX) has been observed in the alloy with Sm addition, and the average grain size (19.6 μm) is the finest among all cases of complete DRX. In terms of DRX mechanism, the addition of Sm significantly refines the initial grains, resulting in higher substructure density formed in the subsequent hot deformation, which thus accelerates the DRX kinetics.