Isothermal omega formation and evolution in the Beta-Ti alloy Ti-5Al-5Mo-5V-3Cr

James Coakley*, Anna Radecka, David Dye, Paul A.J. Bagot, Howard J. Stone, David N. Seidman, Dieter Isheim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The isothermal ω phase of Ti-5Al-5Mo-5V-3Cr wt.% is formed within a 2h heat treatment at 300 ◦C and identified by atom probe tomography as Ti-rich/solute lean precipitates. The composition and size remain essentially constant during ageing, although the volume fraction increases to 9.5% after ageing for 8 h. This is consistent with an ongoing transformation process of athermal ω to isothermal ω. The ω/β interface becomes enriched with oxygen. This may be of significance as oxygen strongly stabilizes the α phase, and the ω/βinterface has previously been suggested as the nucleation site for subsequentα formation.

Original languageEnglish (US)
Pages (from-to)416-424
Number of pages9
JournalPhilosophical Magazine Letters
Volume96
Issue number11
DOIs
StatePublished - Nov 1 2016

Keywords

  • Atom probe tomography
  • ageing
  • nucleation of phase transformations
  • precipitation
  • titanium alloys

ASJC Scopus subject areas

  • Condensed Matter Physics

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