Abstract
Mechanisms of instability and localization of plastic shear during dynamic deformation of metals has been studied theoretically and experimentally. Instability mechanisms are attributed to collective effects in ensembles of microshears in spatially localized areas. Infrared scanning in situ of the instability zone and consequent study of dislocation substructure confirm the crucial role of nonequilibrium transitions in ensembles of defects during development of localized plastic flow. A model of plastic shear instability was developed based on equations that express the correlation between nonequilibrium transitions and mechanisms of structural relaxation and plastic flow.
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