Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys

Norihiko L. Okamoto, Shuhei Kasatani, Martin Luckabauer, Masakazu Tane, Tetsu Ichitsubo

Research output: Contribution to journalArticle

Abstract

We have investigated the effects of solute oxygen on the kinetics of diffusionless isothermal omega (DI-ω) transformation in β-titanium vanadium alloys. This transformation constitutes a third category of ω transformation beside the athermal and isothermal modes. Thermal analysis, hardness and internal friction measurements were conducted after quenching oxygen-containing and near-oxygen-free alloys with ~ 21 at%V from the β-stable temperature. At this level of vanadium concentration, the athermal ω transformation is not expected. It is found that the DI-ω transformation more rapidly progresses in the low oxygen alloy and the relaxation strength of the elementary process of {111}β collapse is significantly reduced.

Original languageEnglish
Pages (from-to)88-91
Number of pages4
JournalScripta Materialia
Volume188
DOIs
Publication statusPublished - 2020 Nov

Keywords

  • Aging
  • Differential scanning calorimetry (DSC)
  • Hardness
  • Internal friction
  • Titanium alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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