The theoretical models are suggested which describe specific plastic deformation mechanisms in nanotwinned materials. Materials containing high-density ensembles of nanoscale twins (nanotwinned materials) exhibit the outstanding mechanical and physical properties - simultaneously high strength and functional ductility at room temperature. These characteristics are achieved due to operating of the specific deformation modes in nanotwinned materials. The theoretical models are suggested which describe specific plastic deformation mechanisms in nanotwinned materials. In the framework of the suggested models, micromechanism of nanotwin widening and micromechanism of combined action of lattice dislocation slip and twin boundary migration in nanotwinned materials are considered. In addition, the detwinning mechanism in ultrafine-grained nanotwinned metals through stress-driven migration of incoherent boundaries of nanoscale twins is examined. It is demonstrated that detwinning of ultrathin twins can occur at very low stresses, while detwinning of thicker twins requires high applied stresses. The theoretical results and their comparison with corresponding experimental data in the exemplary case of nanotwinned cooper (Cu) are discussed.Keywords: nanotwinned materials, nanotwins, plastic deformation, twinning, detwinning.
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