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<p>A dislocation density-based crystal plasticity finite element (CPFE) model is developed to reveal the mechanism of discontinuous dynamic recrystallization (DDRX) of the TC17 dual-phase titanium alloy during hot deformation. The model incorporates the temperature and strain rate dependence of nucleation, growth and evolution during DDRX. The evolution of the dislocation densities in the matrix grains (MGs) and the recrystallized grains (RGs) is considered individually. The mechanical response and underlying microstructural evolution are systematically investigated by comparing the CPFE model predictions with experimental tests. The results indicate that at lower temperatures (700&#xa0;°C and 800&#xa0;°C), TC17 titanium alloy exhibits a higher volume fraction of recrystallization and a notable drop in flow stress. As the temperature increases (900&#xa0;°C and 1000&#xa0;°C), the volume fraction of recrystallization decreases, resulting in a weakened flow stress softening. The nucleation rate of DDRX increases with decreasing deformation temperature and increasing strain rate, while the size of RGs increases with higher temperature and lower strain rate. DDRX nuclei primarily occur at grain boundaries with high dislocation density. Furthermore, DDRX consumes a large number of dislocations and thus reduces the stress concentration and dislocation density at grain boundaries. This study provides a robust model that enhances the understanding of hot deformation mechanisms and informs the design of high-performance titanium alloys for future applications.</p>

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Unraveling the Discontinuous Dynamic Recrystallization of the TC17 Titanium Alloy during Hot Deformation by Crystal Plasticity Modeling

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Xiangru Guo,
  • Jian Zhang,
  • Tieqiang Kong,
  • Junjie Shen,
  • Qingjian Liu,
  • Chaoyang Sun,
  • Peipei Li

摘要

A dislocation density-based crystal plasticity finite element (CPFE) model is developed to reveal the mechanism of discontinuous dynamic recrystallization (DDRX) of the TC17 dual-phase titanium alloy during hot deformation. The model incorporates the temperature and strain rate dependence of nucleation, growth and evolution during DDRX. The evolution of the dislocation densities in the matrix grains (MGs) and the recrystallized grains (RGs) is considered individually. The mechanical response and underlying microstructural evolution are systematically investigated by comparing the CPFE model predictions with experimental tests. The results indicate that at lower temperatures (700 °C and 800 °C), TC17 titanium alloy exhibits a higher volume fraction of recrystallization and a notable drop in flow stress. As the temperature increases (900 °C and 1000 °C), the volume fraction of recrystallization decreases, resulting in a weakened flow stress softening. The nucleation rate of DDRX increases with decreasing deformation temperature and increasing strain rate, while the size of RGs increases with higher temperature and lower strain rate. DDRX nuclei primarily occur at grain boundaries with high dislocation density. Furthermore, DDRX consumes a large number of dislocations and thus reduces the stress concentration and dislocation density at grain boundaries. This study provides a robust model that enhances the understanding of hot deformation mechanisms and informs the design of high-performance titanium alloys for future applications.