Scholarlink

<p>The homogenized Mg-8Ho-3Sm-0.5Zr (HS83K) alloy was subjected to hot compression tests using a Gleeble-1500 thermal simulator under deformation conditions ranging from 350 to 500&#xa0;°C and strain rates between 0.003 and 1&#xa0;s<sup>-1</sup>. The microstructure of HS83K alloy was observed under these varying deformation conditions. The critical strain model for dynamic recrystallization (DRX) was established based on the change in curvature of the work-hardening rate <i>θ</i> and stress <i>σ</i> curves at the onset of DRX, and the deformation activation energy of the HS83K was measured. A constitutive model based on the Arrhenius hyperbolic-sine function was developed through linear fitting, power dissipation and instability diagrams were generated to construct hot processing maps. The results demonstrate that the HS83K exhibits significant DRX behavior during hot compression. Additionally, increasing the deformation temperature and reducing the strain rate promote DRX initiation. A critical strain model for DRX was obtained, and the relationship between peak strain and critical strain was established. The hot activation energy was measured to be 227.7&#xa0;kJ/mol, and the constitutive equation of the HS83K was derived. Furthermore, the safe operating range for the HS83K was determined to be between 370 and 500 °C for temperature and 0.002-0.049&#xa0;s<sup>-1</sup> for strain rate.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hot Deformation Behavior, DRX Critical Strain Model, and Hot Processing Map Construction of Mg-Ho-Sm-Zr Alloy

  • 期刊论文

  • 发表日期：

    2025年8月11日

查看全文
  • Xiaoya Chen,
  • Minglei Zhang,
  • Kang Yao,
  • Quanan Li,
  • Limin Zhu,
  • Hang Leng,
  • Peijun Chen

摘要

The homogenized Mg-8Ho-3Sm-0.5Zr (HS83K) alloy was subjected to hot compression tests using a Gleeble-1500 thermal simulator under deformation conditions ranging from 350 to 500 °C and strain rates between 0.003 and 1 s-1. The microstructure of HS83K alloy was observed under these varying deformation conditions. The critical strain model for dynamic recrystallization (DRX) was established based on the change in curvature of the work-hardening rate θ and stress σ curves at the onset of DRX, and the deformation activation energy of the HS83K was measured. A constitutive model based on the Arrhenius hyperbolic-sine function was developed through linear fitting, power dissipation and instability diagrams were generated to construct hot processing maps. The results demonstrate that the HS83K exhibits significant DRX behavior during hot compression. Additionally, increasing the deformation temperature and reducing the strain rate promote DRX initiation. A critical strain model for DRX was obtained, and the relationship between peak strain and critical strain was established. The hot activation energy was measured to be 227.7 kJ/mol, and the constitutive equation of the HS83K was derived. Furthermore, the safe operating range for the HS83K was determined to be between 370 and 500 °C for temperature and 0.002-0.049 s-1 for strain rate.