Abstract
Changes in the internal structure of a deformed medium are described, in addition to the defect densities, by the kinetic variables (order parameters) related to the collective modes of the macroscopic plastic deformation. The kinetic equations for two order parameters represent a system of nonlinear equations of the reaction-diffusion type. It is demonstrated that instability of a homogeneous solution with respect to inhomogeneous perturbations appears when the characteristic variation lengths of the order parameters markedly differ from each other.
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