Modeling of deformation texture development based on rate independent crystal plasticity

Abstract

Crystal plasticity based on the concept of yield surfaces with rounded corners (Gambin, 1991a,b, 1992a,b; Arminjon, 1991) is applied to the prediction of texture development in plastically deformed f.c.c. metals. With this crystal description, the problem of non-uniqueness in the choice of active slip systems is overcome within the rate-independent approach. The model may be considered as an approximation of that based on the Schmid law. In addition, it describes a wide class of crystals that deviate from the Schmid law. In the present paper, the relation between the stacking fault energy (SFE) of crystalline materials and the parameter describing the roundness of yield surface vertices is suggested. This model allows predictions of reorientation paths and texture development for f.c.c. metals of low, medium and high SFE. As an example, a simulation of ‘brass type’ (for silver) and ‘copper-type’ (for copper and aluminium) rolling textures is presented.