Current understanding of creep behaviour of near γ-titanium aluminides

摘要: AbstractThe literature dealing with creep of near γ-TiAl alloys is reviewed, including single and multiphase compositions. The characteristics in the primary or transient, minimum strain rate pseudo-steady state, tertiary regimes are presented. Considerable experimental evidence indicates that a temperature-stress domain exists which controlled by dislocation climb. For compositions, effect microstructure on discussed, emphasis predominantly lamellar microstructure, exhibits superior resistance. influence composition resistance presented terms intrinsic extrinsic effects, associated role β phase discussed. Models for structures reviewed. current state knowledge regarding precludes quantitative conclusions; however preliminary design resistant microstructures possible.