Combined influence of strain rate and hydrogen on the deformation behavior of a near-α titanium alloy

Yali Xu, Liang Ding, Chong Li, Bobo Li, Shuaifeng Zhang, Jinshan Li, Fuyang Gao, Zhijie Sun, Peng Jiang, Minjie Lai

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The deformation behavior of the near-α titanium alloy Ti–6Al–3Nb–2Zr–1Mo, containing 20–210 ppm hydrogen and tested at strain rates of 105–101 s−1, has been investigated by conducting tensile testing and microstructural characterization. The results show that at strain rates ≤10−3 s−1, increasing hydrogen concentration improves ductility, while it deteriorates ductility at higher strain rates. The change in ductility with increasing strain rate remains relatively small at strain rates ≤10−3 s−1 for all hydrogen concentrations, but at higher strain rates, an increase in strain rate results in a decrease in ductility. Additionally, the addition of hydrogen has little effect on the strain rate sensitivity and work hardening exponent. The detrimental effect of hydrogen addition on ductility at strain rates >10−3 s−1 can be attributed to the enhanced strain localization caused by the presence of hydrogen. In cases of lower strain rates, the increase of ductility with the addition of hydrogen is due to the promotion effect of hydrogen on dislocation mobility.

Original languageEnglish
Article number145474
JournalMaterials Science and Engineering: A
Volume882
DOIs
StatePublished - 24 Aug 2023

Keywords

  • Deformation twin
  • Dislocation
  • Hydrogen
  • Strain rate sensitivity
  • Titanium alloy

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