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

Pather, R and Mitten, W. A. and Holdway, P and Ubhi, H.S. and Wisbey, A and Brooks, Jeffery (2003) The effect of high temperature exposure on the tensile properties of TiAl alloys. Intermetallics, 11 (10). pp. 1015-1027. ISSN 0966-9795

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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.

Item type: Article
ID code: 30651
Keywords: titanium aluminides , thermal stability, Environmental embrittlement , Engineering design
Subjects: Technology > Engineering (General). Civil engineering (General) > Engineering design
Department: Faculty of Engineering > Design, Manufacture and Engineering Management
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 15 Jun 2011 14:52
    Last modified: 17 Jul 2013 10:24
    URI: http://strathprints.strath.ac.uk/id/eprint/30651

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