Influence of oxygen on omega phase stability in the Ti-29Nb-13Ta-4.6Zr alloy

Mitsuo Niinomi, Masaaki Nakai, Mandana Hendrickson, Peeyush Nandwana, Talukder Alam, Deep Choudhuri, Rajarshi Banerjee

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The effect of oxygen on stability of isothermal omega precipitates in Ti-29Nb-13Ta-4.6Zr was examined using X-ray powder diffraction, transmission electron microscopy, and atom probe tomography. Two alloys with 0.1 and 0.4 mass% oxygen were subjected to single step, and two-step annealing heat-treatments to respectively promote omega and alpha formation. After second step annealing, large volume fraction of omega precipitates was retained in 0.4 mass% O alloy while mainly alpha phase was observed in TNTZ-0.1O. The enhanced stability of omega in the higher oxygen containing TNTZ alloys questions the conventionally accepted understanding that oxygen destabilizes the omega phase in titanium alloys.

Original languageEnglish
Pages (from-to)144-148
Number of pages5
JournalScripta Materialia
Volume123
DOIs
Publication statusPublished - 2016 Oct 1

Keywords

  • Atom probe tomography
  • Omega phase
  • Oxygen
  • Phase stability
  • β-titanium alloy

ASJC Scopus subject areas

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

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