Research Progress on Flow Behavior and Constitutive Models of γ-TiAl Alloys Deformed at Elevated Temperature

γ-TiAl alloys with a low density and a high specific stiffness are preferred structural materials for weight saving of aircraft engines. The present paper deeply reviewed the flow behavior and constitutive equations of γ-TiAl alloys compressed at elevated temperature. Deformation processing parameters, deformation history and adjusted preheating treatment, chemical composition and initial microstructures are the main factors that determine the flow behavior of γ-TiAl alloys compressed at elevated temperature. The constitutive models describing flow stress-strain curves are segmented into genres, such as empirical models, models coupled with different softening mechanisms, and models about deformation mechanisms. The Arrhenius model and H-S model were deeply discussed. Also, constitutive model including softening mechanism and models involving deformation mechanisms were summarized and analyzed. It can be predicted that the emphasis on further research in γ-TiAl alloys is to establish constitutive models involving multiphase coordinated deformation mechanisms.