Estimation of the effective coefficient of viscosity within the quasi-viscous mechanism of mass transfer

Abstract

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 propagation of nanobands front of crystal lattice reorientation are studied. The effective viscosity coefficient is estimated depending on the type of point defects (vacancies and interstitial atoms), deformation temperature, the features of the disclination structure and the elastic-stressed state at the front of nanoband propagation. The important role of high local moments or gradient of stress fields in describing the localization of the quasi-viscous 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 amorphous bodies, in particular, of glasses.