| The upgraded Estrin-Tóth model is presented to describe the deformation behavior of the materials subjected to severe plastic deformation. The model has been applied toward study of tension of the as-received Cu samples and the samples after the 1st, 4th, and 8th equal channel angular pressing passes. The dislocation density evolution in the two phases, namely in the boundaries of fragments/cell blocks and interiors, is studied. The evolution of the concentration of vacancies that formed during deformation, annihilation of dislocations during their non-conservative motion and generation of dislocations during multiple cross slip are considered. As a result, peculiarities of the microstructure evolution, causes of achieving high values of the vacancy concentrations and dislocation densities are revealed. Features of the deformation behavior of the considered samples are explained. |
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