Development and Application of the Dislocation Model for Analysis of the Microstructure Evolution and Deformation Behavior of Metals Subjected to Severe Plastic Deformation

摘要

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 1^st, 4^th, and 8^th 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.