Analysis of deformation behavior mechanisms in ultrafine-grained Ti Grade 4 on the basis of computer modeling

A model describing the behavior of elastic–plastic medium with account of kinetics of dislocations has been developed. A method for determining kinetic parameters of the model is described. The model allows analyzing the mechanisms of deformation behavior of metallic materials on the basis of the obtained information on evolution of the average grain size, misorientations between grains, concentration of deformation-induced vacancies, average dislocation density, as well as the dislocation density in grain boundaries and interiors, forest dislocations and density of mobile dislocations depending on the strain degree. The developed model is applied to analyze mechanisms of deformation behavior in ultrafine-grained Ti Grade 4 produced by equal channel angular pressing – conform scheme.

► The elastic–plastic model considering the dislocation kinetics has been developed.
► The mechanisms of the deformation behavior of UFG Ti have been analyzed.
► The model is applicable for analysis of homogeneous and heterogeneous flow.