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<p>The microstructure and service performance of TC11 titanium alloy are highly sensitive to hot working conditions. Therefore, this study examines the high-temperature deformation behavior and microstructural evolution of TC11 titanium alloy, emphasizing the effects of deformation temperature and strain rate on its flow stress characteristics. A strain-compensated Arrhenius-type constitutive model was developed to accurately predict flow stress under various conditions. The model demonstrated high predictive accuracy, with a correlation coefficient (<i>R</i><sup>2</sup>) of 0.9984 and an average absolute relative error (AARE) of 0.6037%. Microstructural analysis revealed a transition from dynamic recovery (DRV) to discontinuous dynamic recrystallization (DDRX), with notable grain refinement occurring at elevated temperatures. Hot working maps were developed using the Murty and Prasad criteria to identify the optimal processing window for the TC11 alloy. Hot processing maps constructed using the Prasad and Murty instability criteria indicated an optimal processing window of 1123–1223&#xa0;K and 0.01–0.1&#xa0;s<sup>−1</sup>. The Murty criterion showed better agreement with observed microstructural instability, providing a more reliable basis for optimizing hot working parameters of TC11 titanium alloy.</p>

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Systematic Study of Hot Deformation Behavior and Optimal Processing Parameters of TC11 Titanium Alloy

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Jielong Zhang,
  • Jun Cai,
  • Jinyun Yang,
  • Ke Li,
  • Chongchong Li,
  • Qiang Liu,
  • Lin Chen,
  • Peng Zhang,
  • Biao Xiang,
  • Kuaishe Wang

摘要

The microstructure and service performance of TC11 titanium alloy are highly sensitive to hot working conditions. Therefore, this study examines the high-temperature deformation behavior and microstructural evolution of TC11 titanium alloy, emphasizing the effects of deformation temperature and strain rate on its flow stress characteristics. A strain-compensated Arrhenius-type constitutive model was developed to accurately predict flow stress under various conditions. The model demonstrated high predictive accuracy, with a correlation coefficient (R2) of 0.9984 and an average absolute relative error (AARE) of 0.6037%. Microstructural analysis revealed a transition from dynamic recovery (DRV) to discontinuous dynamic recrystallization (DDRX), with notable grain refinement occurring at elevated temperatures. Hot working maps were developed using the Murty and Prasad criteria to identify the optimal processing window for the TC11 alloy. Hot processing maps constructed using the Prasad and Murty instability criteria indicated an optimal processing window of 1123–1223 K and 0.01–0.1 s−1. The Murty criterion showed better agreement with observed microstructural instability, providing a more reliable basis for optimizing hot working parameters of TC11 titanium alloy.