NUMERICAL SIMULATIONS OF STRESS-STRAIN BEHAVIOR IN 2-PHASE ALPHA(2)+GAMMA LAMELLAR TIAL ALLOYS

Polycrystalline stress-strain behavior in a(2) + gamma lamellar TiAl a lloys is numerically simulated, using a rate-dependent thermoelastic-v iscoplastic, finite strain, crystallographic slip formulation elucidat ing 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 indivi dual slip system level. The model accomplishes the transition to the a veraged aggregate behavior, and is a reliable technique to monitor and track the various anisotropies of single crystals as implicit in the polycrystalline aggregates.