Modeling texture evolution during rolling of a Cu–Nb multilayered system

Abstract

A polycrystal plasticity model is proposed to predict the unique rolling texture of Cu/Nb nanostructured multilayers. At this length scale, the model accounts for the interface between Cu and Nb layers by computing the aggregate response of composite grains using a viscoplastic self–consistent scheme. Each composite grain is divided into Cu and Nb crystals with the interface parallel to the rolling plane, and compatibility and equilibrium are enforced across the interface. A latent hardening effect is introduced to account for the interaction between glide and interface dislocations. The latter are accumulated during slip transmission. This unconventional hardening confines the movement of glide dislocations by promoting symmetry of slip activities. Consequently, it slows development of the rolling texture for Cu/Nb nanolayers, and partially preserves the initial interface orientation defined by the Kurdjumov–Sachs relationship.

Acknowledgements

This work was supported under the U.S. Department of Energy Stewardship Science Academic Alliances Program, DOE DEFG03-02-NA00072. The portion of the research conducted at Los Alamos was funded by DOE, Office of Science, Office of Basic Energy Sciences. The authors acknowledge helpful discussions with J.D. Embury, R.G. Hoagland, P.M. Anderson and J.F. Bingert.

Notes

Raabe et al. applied the RC hypothesis to better predict texture development in the Nb phase of a rolled Cu–20% Nb composite [22].