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<p>An AZ61 Mg alloy was processed by high-pressure sliding (HPS) at room temperature under a pressure of 2&#xa0;GPa for ultrafine grain refinement. The hardness measurement resulted in ~ 120&#xa0;HV on the transverse cross section and slid plane of the processed sample, indicating homogeneous introduction of strain throughout the HPS-processed sample. Tensile tests at elevated temperatures showed a superplastic elongation of ~ 510% at a temperature of 300&#xa0;°C with an initial strain rate of 5.5 × 10<sup>–4</sup>&#xa0;s<sup>−1</sup>. A strain rate sensitivity of ~ 0.3 was measured, and the activation energy of 83&#xa0;kJ/mol was obtained, suggesting that the deformation at this elevated temperature occurs by grain boundary sliding accommodated by dislocation movement and controlled by grain boundary diffusion. Electron backscatter diffraction analysis validated the degree of grain refinement achieved through the HPS process and showed evidence of dynamic grain growth during the deformation. In this study, the process of incremental feeding HPS (IF-HPS) was also carried out to successfully scale up the HPS-processed area with the total elongation of ~ 320%.</p>

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Superplasticity of AZ61 alloy processed by high-pressure sliding (HPS) and incremental feeding HPS

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Ammar Abdulkareem Hashim Al-Ameri,
  • Intan Fadhlina Mohamed,
  • Ahmad Muhammad Aziz,
  • Mohd Zaidi Omar,
  • Shahir Mohd Yusuf,
  • Shinichi Inoue,
  • Manabu Yumoto,
  • Yoichi Takizawa,
  • Zenji Horita

摘要

An AZ61 Mg alloy was processed by high-pressure sliding (HPS) at room temperature under a pressure of 2 GPa for ultrafine grain refinement. The hardness measurement resulted in ~ 120 HV on the transverse cross section and slid plane of the processed sample, indicating homogeneous introduction of strain throughout the HPS-processed sample. Tensile tests at elevated temperatures showed a superplastic elongation of ~ 510% at a temperature of 300 °C with an initial strain rate of 5.5 × 10–4 s−1. A strain rate sensitivity of ~ 0.3 was measured, and the activation energy of 83 kJ/mol was obtained, suggesting that the deformation at this elevated temperature occurs by grain boundary sliding accommodated by dislocation movement and controlled by grain boundary diffusion. Electron backscatter diffraction analysis validated the degree of grain refinement achieved through the HPS process and showed evidence of dynamic grain growth during the deformation. In this study, the process of incremental feeding HPS (IF-HPS) was also carried out to successfully scale up the HPS-processed area with the total elongation of ~ 320%.