Numerical simulations of stress-strain behavior in two-phase α2 + γ lamellar TiAl alloys

Polycrystalline stress-strain behavior in α2 + γ lamellar TiAl alloys is numerically simulated, using a rate-dependent thermoelastic-viscoplastic, finite strain, crystallographic slip formulation elucidating the constitutive response of their single crystals of the alloys. Input to the model includes descriptions of the orientation-dependent single-crystal plastic behavior, strain rate sensitivity on the individual slip system level. The model accomplishes the transition to the averaged aggregate behavior, and is a reliable technique to monitor and track the various anisotropies of single crystals as implicit in the polycrystalline aggregates.