Environmental embrittlement of a third generation γ TiAl alloy

S. L. Draper*, D. Isheim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Exposure of a Ti-45Al-5Nb alloy to elevated temperatures has been shown to result in a loss of ductility resulting from a near surface effect involving diffusion of oxygen into the alloy. Local electrode atom probe analysis was conducted at 2, 13, and 25 μm distance from the oxide/base-metal interface. Oxygen was preferentially located in the α 2 phase with concentrations up to 14.8 at.% and diminishing with increasing distance from the surface. Near surface microstructural changes were only visible up to 10 μm from the surface but the oxygen diffusion significantly exceeded that distance. The diffusion coefficient of oxygen into the α 2 phase was estimated based on the oxygen concentrations obtained from local electrode atom probe analysis. Fluorine ion implantation on the surface was investigated as a possible solution to the embrittlement.

Original languageEnglish (US)
Pages (from-to)77-83
Number of pages7
JournalIntermetallics
Volume22
DOIs
StatePublished - Mar 2012

Keywords

  • A. Titanium aluminides, based on TiAl
  • B. Diffusion
  • B. Environmental embrittlement
  • B. Surface properties
  • F. Atom probe
  • F. Microprobe

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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