Simulation of Persistence Characteristics of Textures During Plastic Deformation

Abstract

The ideal orientations of textures that develop at large strains can be identified with the help of crystal plasticity simulations. In this short review, an overview is presented on these types of simulations that helped in the identification of the deformation texture components of fcc, bcc and hcp materials in pure shear (rolling) as well as in simple shear (torsion) during the last 20 years. The technique is based on the so-called persistence parameter that was introduced by Tóth, Gilormini and Jonas in 1988 [Acta Metall., 36, 3077–3091]. The formation of textures and several texture effects can be understood with the help of the persistence parameter together with the rotation field of orientations in Euler space and the divergence quantity. The stability of ideal orientations is especially investigated and it is shown that simple shear distinguishes from pure shear in a very particular way; all ideal orientations of simple shear are positioned at orientations where the divergence is zero while in rolling they are situated within a negative divergence field.