Creep of γ-TiAl Based Alloys — Experiments and Computational Modeling

Intermetallic γ-TiAl based materials are qualified to become an important material for advanced applications especially in aeroengine and aerospace industries (Kim, 1994). Research and development have progressed significantly within the last few years and led to comprehensive understanding of fundamental correlations between alloy composition and microstructure, processing behavior and mechanical properties. It is well known that the mechanical properties of y-TiAl alloys depend strongly on microstructure, which in turn is influenced by the alloy chemistry and the applied heat treatments. A designed fully lamellar (DFL) microstructure which consists of colonies of parallel γ-TiAl (tetragonal face centered L10 structure) and α2-Ti3Al (ordered hexagonal DO19 structure) laths with a colony size in the range of 150–200μm possesses superior creep resistance.