Room temperature fatigue response of γ-TiAl to impact damage

Abstract

Gamma based titanium aluminides have received considerable attention recently as candidate materials in gas turbine applications, particularly low pressure turbine blades. Their low density and high specific stiffness, result in potentially significant weight savings in structures such as gas turbine engines if substituted for current materials. The objective of the present study is to characterize and quantify the damage resulting from low-speed impacts on {gamma}-TiAl and to relate this impact damage to reductions in fatigue failure stress by the use of a threshold-based model.