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<p>The stress relaxation (SR) process plays a significant role in improving dimensional accuracy and reducing the residual stress of machined parts. Unfortunately, the study on SR performance of the near <i>α</i> titanium alloy with bimodal microstructure is lacking. We explored the SR behaviors and mechanisms of Ti6321 alloys with a bimodal microstructure at temperatures of 500 ~ 800&#xa0;°C and under initial tensile displacements of 1 ~ 2&#xa0;mm. The initial displacement hardly affects the SR rate and limit. The temperatures at 600 ~ 650&#xa0;°C are critical window parameters to promote active elastic to plastic strain, almost resulting in complete SR. Except for dislocation slip, tangle, and annihilation, both equiaxed <i>α</i> growth and lamellar <i>α</i> coarsening are also responsible for SR at different temperatures to some extent. The SR mechanisms transform from dislocation glide to dislocation glide and grain boundary sliding, further to grain boundary sliding and diffusion creep, with corresponding temperatures of 500, 650 and 800&#xa0;°C. These results offer valuable insights into potential process parameter design and SR mechanisms of the near <i>α</i> titanium alloy with bimodal microstructure.</p>

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Adjusting Temperature and Initial Displacement: Stress Relaxation Performance of Ti6321 Titanium Alloy with Bimodal Microstructure

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Xiaofei Wu,
  • Yifan Lv,
  • Xiaoyu Zhu,
  • Wei Fan,
  • Xifeng Li

摘要

The stress relaxation (SR) process plays a significant role in improving dimensional accuracy and reducing the residual stress of machined parts. Unfortunately, the study on SR performance of the near α titanium alloy with bimodal microstructure is lacking. We explored the SR behaviors and mechanisms of Ti6321 alloys with a bimodal microstructure at temperatures of 500 ~ 800 °C and under initial tensile displacements of 1 ~ 2 mm. The initial displacement hardly affects the SR rate and limit. The temperatures at 600 ~ 650 °C are critical window parameters to promote active elastic to plastic strain, almost resulting in complete SR. Except for dislocation slip, tangle, and annihilation, both equiaxed α growth and lamellar α coarsening are also responsible for SR at different temperatures to some extent. The SR mechanisms transform from dislocation glide to dislocation glide and grain boundary sliding, further to grain boundary sliding and diffusion creep, with corresponding temperatures of 500, 650 and 800 °C. These results offer valuable insights into potential process parameter design and SR mechanisms of the near α titanium alloy with bimodal microstructure.