On the stability of the ideal orientations of rolling textures for F.C.C. polycrystals

Abstract

The stability of the ideal orientations of rolling textures for f.c.c. metals ( cube, Goss, brass, copper, Taylor and S) and their influence on texture formation are investigated. The characteristics of the three-dimensional lattice rotation fields at and in the vicinity of these orientations, as well as the development of preferred orientations during deformation, are simulated numerically using a rate-sensitive crystal plasticity model. Three types of boundary conditions are considered: plane strain compression, “lath” compression, and “pancake” compression. The investigation shows that, with the help of the three-dimensional rotation fields, the rotation characteristics of an orientation can be described by its rate of change in Euler space, the corresponding gradients and the relative rate of change of its ODF intensity. The formation of rolling textures depends on the characteristics of the α ( Goss-brass) and β fibres. Boundary conditions affect the composition of β and the flow velocity of orientations towards and along α and β, and consequently result in different texture components after large deformation.