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<p>The classic Ti-44Al-8Nb-0.1B alloy was chosen as the research object. To investigate the phase transformation process of the alloy during low-temperature annealing with and without triaxial compressive stress, after the alloy was quenched in liquid nitrogen at 1300&#xa0;°C to form the metastable α<sub>2</sub> phase. First, the samples were held at 1300&#xa0;°C for 30&#xa0;min and then quenched in liquid nitrogen. Subsequently, the liquid nitrogen-quenched samples were subjected to low-temperature (600, 700, 800&#xa0;°C) and short time (30&#xa0;min) annealing under the conditions with and without triaxial compressive stress, followed by air cooling. Finally, one group of samples was subjected to mechanical polishing, electrolytic polishing and scanning electron back-scattered diffraction (EBSD), while the other group was treated with mechanical polishing, chemical etching and scanning electron microscopy (SEM). The results show that the degree of α<sub>2</sub> → γ phase transformation increases gradually with the rise in temperature. However, the application of stress gives rise to a profound increase in the degree of α<sub>2</sub> → γ phase transformation. This is because the application of stress increases the internal residual stress of the samples, thereby increasing the number of dislocations. And then the heterogeneous nucleation sites required for the formation of γ phase within the metastable α<sub>2</sub> phase.</p>

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Phase Transformation Behavior of α2 to γ Phases of Ti-44Al-8Nb-0.1B Alloy under Low Temperature and Triaxial Compression Conditions after Liquid Nitrogen Quenching

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Longhao Huang,
  • Shulin Dong,
  • Zhidong Zhang,
  • Yiyuan Chang,
  • Yingdong Qu,
  • Guanglong Li,
  • Wei Zhang

摘要

The classic Ti-44Al-8Nb-0.1B alloy was chosen as the research object. To investigate the phase transformation process of the alloy during low-temperature annealing with and without triaxial compressive stress, after the alloy was quenched in liquid nitrogen at 1300 °C to form the metastable α2 phase. First, the samples were held at 1300 °C for 30 min and then quenched in liquid nitrogen. Subsequently, the liquid nitrogen-quenched samples were subjected to low-temperature (600, 700, 800 °C) and short time (30 min) annealing under the conditions with and without triaxial compressive stress, followed by air cooling. Finally, one group of samples was subjected to mechanical polishing, electrolytic polishing and scanning electron back-scattered diffraction (EBSD), while the other group was treated with mechanical polishing, chemical etching and scanning electron microscopy (SEM). The results show that the degree of α2 → γ phase transformation increases gradually with the rise in temperature. However, the application of stress gives rise to a profound increase in the degree of α2 → γ phase transformation. This is because the application of stress increases the internal residual stress of the samples, thereby increasing the number of dislocations. And then the heterogeneous nucleation sites required for the formation of γ phase within the metastable α2 phase.