Crystal plasticity FEM study on the influence of crystallographic orientation in copper single crystals subjected to equal channel angular pressing
Over the lasts two decades equal channel angular pressing (ECAP) has been widely used to produce ultrafine grained microstructures with excellent mechanical properties in metallic materials. In this paper, a crystal plasticity finite element method (CPFEM) investigation has been carried out to examine the texture evolution and deformation heterogeneity of copper single crystals deformed by ECAP process. Two single crystals were simulated to examine the influence of initial crystallographic orientation. In the first crystal, the (111) slip plane and the  slip direction have been rotated by 20° in a clockwise direction around the transverse direction from the theoretical shear plane and theoretical shear direction of the ECAP die, respectively. By contrast in the second crystal, the (111) slip plane and the  slip direction were rotated 20° in a counter‐clockwise direction. The results of the simulation show that the initial crystallographic orientation has a great influence on the deformed geometry, formation of the corner gap, distribution of the plastic strain rate and texture evolution when copper single crystals are undergoing ECAP process. The crystallographic rotation patterns during deformation have been quantitatively estimated and the predicted textures are consistent with the experimental results in the literature.
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