Features of dynamic effects in irradiated metals
V.V. Malashenko
Donetsk Institute for Physics and Engineering named after A.A. Galkin
DOI: 10.26456/pcascnn/2025.17.102
Short communication
Abstract: A theoretical analysis of edge dislocation ensemble slip in irradiated metal with a high concentration of nanoscale defects (prismatic dislocation loops) is performed. The problem is solved within the framework of the theory of dynamic interaction of defects. High strain rate deformation occurs in the irradiated metal under intense external impact. The dissipation mechanism consists in the irreversible transition of the energy of external impact into the energy of transverse oscillations of a dislocation in the slip plane. The efficiency of this mechanism depends on the presence of a gap in the spectrum of dislocation oscillations. In our case, the spectral gap appears as a result of the collective interaction of dislocations. Analytical expression for the dependence of the dynamic yield strength on dislocation loop concentration and the dislocations density in the irradiated metal is obtained. The effect of dry friction of dislocations is predicted. It consists in the fact that the force of dynamic drag of dislocations by circular dislocation loops does not depend on the dislocations velocity. Accordingly, the contribution of dislocation loops into the dynamic yield strength of irradiated metal does not depend on the strain deformation rate. Calculated estimates of the contributions of dry friction of dislocations into the dynamic yield strength of irradiated metals are made. The value of this contribution can reach 108 Pa.
Keywords: high strain rate deformation, dislocations, dislocation loops, radiation defects, irradiated metals
- Vadim V. Malashenko – Dr. Sc., Professor, Chief Researcher of the Department «Theory of kinetic and electronic properties of nonlinear systems», Donetsk Institute for Physics and Engineering named after A.A. Galkin
For citation:
Malashenko V.V. Osobennosti dinamicheskikh effektov v obluchyonnykh metallakh [Features of dynamic effects in irradiated metals], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 102-108. DOI: 10.26456/pcascnn/2025.17.102. ⎘
Full article (in Russian): download PDF file
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