The effect of high temperature exposure on the tensile properties of TiAl alloys

R Pather, W. A. Mitten, P Holdway, H.S. Ubhi, A Wisbey, Jeffery Brooks

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The lightweight γ titanium aluminide alloys offer good mechanical properties for gas turbine applications at temperatures up to 700 °C. An important characteristic of these materials will be their mechanical performance after exposure to anticipated service temperatures. Thus cast Ti-46Al-2W and extruded Ti-46Al-5Nb-1W have been subjected to thermal exposure at temperatures between 500 and 700 °C for up to 1000 h. This showed that the bulk microstructure was stable and resulted in little or no change in tensile properties after exposure. However, once surface effects were included in the tensile properties, then the values of both room temperature tensile strength and ductility reduced significantly. The room temperature property reductions were thought to be associated with changes in the surface residual stress state. Other potential factors include premature surface cracking, due to either localised hydrogen or oxygen embrittlement.
Original languageEnglish
Pages (from-to)1015-1027
Number of pages13
JournalIntermetallics
Volume11
Issue number10
DOIs
Publication statusPublished - 2003

Keywords

  • titanium aluminides
  • thermal stability
  • Environmental embrittlement

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    Pather, R., Mitten, W. A., Holdway, P., Ubhi, H. S., Wisbey, A., & Brooks, J. (2003). The effect of high temperature exposure on the tensile properties of TiAl alloys. Intermetallics, 11(10), 1015-1027. https://doi.org/10.1016/S0966-9795(03)00116-X