Scholarlink

<p>The study systematically investigates the strain-dependent <i>β</i>→<i>α</i> phase transformation kinetics in Ti-55511 titanium alloy during thermomechanical processing at 740 °C followed by 840 °C heat treatment. Experimental evidence reveals that strain-induced <i>β</i>→<i>α</i> transformation exhibits significant strain sensitivity, with maximum transformation efficiency achieved below the critical strain threshold of 1.3 where dynamic recrystallization (DRX) remains limited. In this regime, most <i>α</i> precipitates strictly obey the Burgers orientation relationship (BOR). Beyond the critical strain of 1.3, microstructural evolution undergoes a marked transition characterized by the appearance of recrystallized <i>α</i> phases at serrated <i>β</i> grain boundaries and intragranular regions, accompanied by substantial orientation dispersion. Quantitative variant analysis demonstrates systematic evolution of <i>α</i> phase selection, with dominant variants shifting from 50–60 deg/&lt; −&#xa0;12–10&gt; to 80–90 deg/&lt; −&#xa0;12–10&gt; configurations with increasing strain. Post-treatment crystallographic analysis identifies two distinct nucleation behaviors: <i>α</i> phases at <i>β</i> high-angle grain boundaries display more than 20 deg BOR deviations, while those at multi-junction <i>β</i> subgrain boundaries exhibit moderate 10 to 20 deg deviations. Notably, thermal annealing enhances BOR fidelity, with the population of near-BOR <i>α</i> phases (0 to 5 deg deviation) increasing by 38 pct compared to the deformed state, demonstrating partial crystallographic restoration through heat treatment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on Strain-Induced α Dynamic Phase Transformation of Ti-55511 Titanium Alloy During Hot Working

  • 期刊论文

  • 发表日期：

    2025年9月30日

查看全文
  • Yue Dong,
  • Haozhe Niu,
  • Yuyuan Zhao

摘要

The study systematically investigates the strain-dependent β→α phase transformation kinetics in Ti-55511 titanium alloy during thermomechanical processing at 740 °C followed by 840 °C heat treatment. Experimental evidence reveals that strain-induced β→α transformation exhibits significant strain sensitivity, with maximum transformation efficiency achieved below the critical strain threshold of 1.3 where dynamic recrystallization (DRX) remains limited. In this regime, most α precipitates strictly obey the Burgers orientation relationship (BOR). Beyond the critical strain of 1.3, microstructural evolution undergoes a marked transition characterized by the appearance of recrystallized α phases at serrated β grain boundaries and intragranular regions, accompanied by substantial orientation dispersion. Quantitative variant analysis demonstrates systematic evolution of α phase selection, with dominant variants shifting from 50–60 deg/< − 12–10> to 80–90 deg/< − 12–10> configurations with increasing strain. Post-treatment crystallographic analysis identifies two distinct nucleation behaviors: α phases at β high-angle grain boundaries display more than 20 deg BOR deviations, while those at multi-junction β subgrain boundaries exhibit moderate 10 to 20 deg deviations. Notably, thermal annealing enhances BOR fidelity, with the population of near-BOR α phases (0 to 5 deg deviation) increasing by 38 pct compared to the deformed state, demonstrating partial crystallographic restoration through heat treatment.