Crystal plasticity finite element analyses of cyclic deformation of compatible type face-centered cubic bicrystals were performed. The model specimen used was a virtual face-centered cubic bicrystal with an isotropic elastic property; therefore, the effect of constraint due to elastic incompatibility does not appear. The results of the analysis show the strain-amplitude-dependence of both the organization of the geometrically necessary dislocation structure and the stress–strain behavior. The calculated stress–strain curve with the largest strain amplitude exhibited additional cyclic hardening. The microscopic mechanisms of the strain-amplitude-dependent organization of the geometrically necessary dislocation structure and additional cyclic hardening behavior were discussed in terms of the activation of secondary slip system(s). Finally, the effects of the elastic anisotropy, the lattice friction stress and the interaction between dislocations were also argued.

Geometrically Necessary Dislocation Structure Organization in FCC Bicrystal Subjected to Cyclic Plasticity. T.Mayama, T.Ohashi, R.Kondou: International Journal of Plasticity, 2009, 25[11], 2122-40