Specific features of inelastic processes in materials with nanoscale defects
V.V. Malashenko1,2, T.I. Malashenko3,4
1 Donetsk Institute for Physics and Engineering named after A.A. Galkin
2 Donetsk National University
3 Donetsk National Technical University
4 Donetsk National University of Economics and Trade named after Mikhail Tugan-Baranovskiy
Abstract: The high strain rate deformation of alloys containing Guinier-Preston zones under high- energy external influences has been theoretically analyzed. The analysis was carried out within the framework of the theory of dynamic interaction of structural defects. The investigated dissipation mechanism consists in the irreversible transfer of energy of an external impact into the energy of dislocation vibrations. An analytical expression for the dynamic yield stress taking into account all structural defects of the alloy has been obtained. It is shown that, under high-energy external influences, nanoscale defects affect the nature of the dependence of mechanical properties on the concentration of atoms of the second component. The dependence of the dynamic yield stress on the atomic concentration of the second component becomes nonmonotonic and has a minimum. Numerical estimates of the concentration corresponding to the minimum yield stress has been made. At this concentration value, a transition occurs from the dominance of the dislocation drag by the Guinier-Preston zones to the dominance of the drag by the atoms of the second component.
Keywords: high strain rate deformation, dislocations, Guinier-Preston zones, point defects, nanomaterials
- Vadim V. Malashenko – Dr. Sc., Professor, Chief Researcher, Department of Theory of kinetic and electronic properties of nonlinear systems, Donetsk Institute for Physics and Engineering named after A.A. Galkin, Professor, Department of Radiophysics and Infocommunication Technologies Donetsk National University
- Tatyana I. Malashenko – Senior Lecturer, Department of Physics, Donetsk National Technical University, Senior Lecturer, Department of Natural Sciences and Life Safety Donetsk National University of Economics and Trade named after Mikhail Tugan-Baranovskiy
Malashenko, V.V. Specific features of inelastic processes in materials with nanoscale defects / V.V. Malashenko, T.I. Malashenko // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2021. — I. 13. — P. 272-277. DOI: 10.26456/pcascnn/2021.13.272. (In Russian).
Full article (in Russian): download PDF file
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