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<p>This study investigates the microstructural evolution associated with static recrystallization (SRX) during hot deformation of 2A14 aluminum alloy. Double-pass hot compression tests were performed using a Gleeble−3800 thermo-mechanical simulator under deformation temperatures of 350-450&#xa0;°C, inter-pass times of 10-60&#xa0;s, strain rates of 0.01-1&#xa0;s<sup>−1</sup>, and true strains of 0.105-0.2. Based on the experimental results, an SRX kinetics model and a grain size prediction model were established. Microstructures were characterized using electron backscatter diffraction (EBSD). The predicted time for 50% recrystallization (t<sub>0.5</sub>) from the kinetics model showed good agreement with the experimental data, with a correlation coefficient of 0.973. Similarly, the grain size model exhibited excellent consistency with the measured values, with a correlation coefficient of 0.994, confirming the reliability and accuracy of the developed models. EBSD analysis reveals that subgrain rotation is the dominant nucleation mechanism for SRX. Thermal activation promotes misorientation accumulation within subgrains, leading to the formation of new equiaxed recrystallized grains. In addition, grain boundary bulging also contributes to the recrystallization process. Regions with high dislocation density store significant deformation energy, providing the driving force for nucleation and growth of recrystallized grains.</p>

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Development of a Kinetic Model and Investigation of the Subgrain Rotation Nucleation Mechanism during Static Recrystallization of 2A14 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Yongxing Jiao,
  • Guolei Dong,
  • Zhizhong Wang,
  • Xuetong Zhu,
  • Fei Chen

摘要

This study investigates the microstructural evolution associated with static recrystallization (SRX) during hot deformation of 2A14 aluminum alloy. Double-pass hot compression tests were performed using a Gleeble−3800 thermo-mechanical simulator under deformation temperatures of 350-450 °C, inter-pass times of 10-60 s, strain rates of 0.01-1 s−1, and true strains of 0.105-0.2. Based on the experimental results, an SRX kinetics model and a grain size prediction model were established. Microstructures were characterized using electron backscatter diffraction (EBSD). The predicted time for 50% recrystallization (t0.5) from the kinetics model showed good agreement with the experimental data, with a correlation coefficient of 0.973. Similarly, the grain size model exhibited excellent consistency with the measured values, with a correlation coefficient of 0.994, confirming the reliability and accuracy of the developed models. EBSD analysis reveals that subgrain rotation is the dominant nucleation mechanism for SRX. Thermal activation promotes misorientation accumulation within subgrains, leading to the formation of new equiaxed recrystallized grains. In addition, grain boundary bulging also contributes to the recrystallization process. Regions with high dislocation density store significant deformation energy, providing the driving force for nucleation and growth of recrystallized grains.