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Dislocation Pattern Formation in the Course of Plastic Deformation
Maksimov, I . L .,Sarafanov, G . F . 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.4
The self-consistent evolution of a two-dimensional screw dislocation ensemble is investigated in plastically deformed crystal. A generalized isotropical multicomponent model for dislocation dynamics is proposed. It is found that the intense relaxation process of the excess Burgers vector of the two-dimensional screw dislocat ensemble results in the establishment of an effective diffusion regime for average density ρ_s(r, t) evolution. In a two-component system this gives rise to mutual component interdiffusion, playing an important role in the nonlinear evolution stage. Two types of-spatial structures are found to emerge in the course of plastic deformation: i) a one-dimensional structure, which is established due to rivalry between unstable modes and results in the emergence of reorientation bands in the crystal; ii) a two-dimensional structure, which is established due to cooperation of the modes and is responsible for the hexagonal cell formation in the crystal. It is shown that for a sufficiently low strain level a hexagonal cellular structure is preferable.