Multisite model prediction of texture induced anisotropy in brass

Abstract

Twinning is commonly observed above a certain level of deformation at room temperature in face centred cubic (fcc) metals with low stacking fault energy (SFE). Twins carry a part of the plastic deformation and they act as barriers to dislocation motion, leading to anisotropic hardening already at the crystal level. The influence of deformation twinning on the development of texture and the related anisotropy and hardening is investigated in this study by means of experimental observations as well as an advanced crystal plasticity model. The latter ”multisite” model takes account of short range interaction among adjacent grains. Anisotropy is assessed based on mechanical tests in uniaxial tension and torsion. When simulation of torsion rely on a simplified one-dimensional finite element modeling, the crystal plasticity model yields qualitative predictions of the strengthening, the texture development and the Swift effect. More accurate predictions would require three-dimensional simulation of the torsion test.