WEB Crystal plasticity phase-field simulation of deformation twinning in single and polycrystalline pure titaniumFriday (25.09.2020) 11:20 - 11:35 M: Modelling and Simulation 1 Part of:
Twinning, in most hexagonal closed packed metals, under certain conditions is a crucial deformation mode and increases as the deformation temperature is lowered. Here, we present a phase-field method combined with a crystal-plasticity model, including twinning mechanism of titanium alloy to study the mechanical response and texture evolution of pure titanium during severe plastic deformation at room temperature. The model considers basal slip, prismatic slip, pyramidal < a > slip, two types of pyramidal < a+c > slip and < 101̄2 >, < 112̄2 > twinning. The model is applied to single and polycrystalline titanium. For a better understanding of the deformation mechanism and to discriminate the individual effects, the influence of slip and twin activities on the deformation behaviour is also studied separately. The results of the simulations are compared to experimental data from tension-compression experiments with respect to the crystallographic texture evolution, stress-strain curves and effect of slip-twin activity on deformation behaviour.
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