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<p>This study investigates the effect of extrusion ratio on the dynamic recrystallization, texture evolution, and mechanical properties of an electric-pulse-refined (EPR) 7050 aluminum alloy during hot extrusion. After homogenization, the EPR-refined alloy exhibited a relatively uniform initial microstructure with reduced non-equilibrium eutectic constituents, providing a suitable basis for studying extrusion-ratio-dependent evolution. However, because no conventionally cast 7050 alloy was included, the independent contribution of EPR cannot be quantitatively separated. With increasing extrusion ratio, the alloy shows progressive grain refinement, enhanced dynamic recrystallization, redistribution of second-phase particles, and strengthened extrusion fiber texture. The average grain size decreases from 43.91&#xa0;<i>μ</i>m at an extrusion ratio of 5.8&#xa0;<i>μ</i>m to 17.78&#xa0;<i>μ</i>m at 20.3, indicating that higher extrusion ratios promote refinement rather than coarsening. This evolution is mainly attributed to increased accumulated strain and stored deformation energy, which drive the transition from dynamic recovery to dynamic recrystallization. The resulting higher recrystallized fraction and increased high-angle grain boundaries improve the microstructural uniformity and mechanical properties.</p>

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Effect of Extrusion Ratio on Dynamic Recrystallization, Texture Evolution, and Mechanical Properties of an Electric-Pulse-Refined 7050 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Dongyu Ma,
  • Shunde Jiang,
  • Kaijiao Kang,
  • Xiaofang Yuan,
  • Jinsong Zhao,
  • Zehua Yan

摘要

This study investigates the effect of extrusion ratio on the dynamic recrystallization, texture evolution, and mechanical properties of an electric-pulse-refined (EPR) 7050 aluminum alloy during hot extrusion. After homogenization, the EPR-refined alloy exhibited a relatively uniform initial microstructure with reduced non-equilibrium eutectic constituents, providing a suitable basis for studying extrusion-ratio-dependent evolution. However, because no conventionally cast 7050 alloy was included, the independent contribution of EPR cannot be quantitatively separated. With increasing extrusion ratio, the alloy shows progressive grain refinement, enhanced dynamic recrystallization, redistribution of second-phase particles, and strengthened extrusion fiber texture. The average grain size decreases from 43.91 μm at an extrusion ratio of 5.8 μm to 17.78 μm at 20.3, indicating that higher extrusion ratios promote refinement rather than coarsening. This evolution is mainly attributed to increased accumulated strain and stored deformation energy, which drive the transition from dynamic recovery to dynamic recrystallization. The resulting higher recrystallized fraction and increased high-angle grain boundaries improve the microstructural uniformity and mechanical properties.