The study of plastic deformation regularities by flows of point defects in fields of high local pressure gradients in metal materials

Within the quasi-viscous mechanism of plastic deformation by flows of nonequilibrium point defects in fields of high local pressure gradients, the features of the nanobands front propagation of the crystal lattice reorientation are studied.A theoretical analysis of the point defects rates and carriers of the rotational deformation mode - nanodipoles of partial disclinations is conducted depending on the type of point defects (vacancies and interstitial atoms), the deformation temperature, features of the disclination structure and the elastically stressed state at the nanobandfront.The possibility of simultaneous realization of martensitic and quasi-viscous deformation modes at this front is shown.The effective coefficient of viscosity is estimated for various activation energies of migration and temperatures.The important role of high local moments or gradient of stress fields in the realization of the rotational deformation mode is established.It is shown that under conditions of high local stress fields, the viscosity of the material can reach values close to the viscosity of liquid glasses.

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