Issues »  Volume 39, Issue 2

Modelling of Kinetics of Modes of a Fragmentation of Materials at a Severe Plastic Deformation

O. V. Khomenko$^{1}$, D. S. Troshchenko$^{1}$, L. S. Metlov$^{2}$

$^{1}$Sumy State University, 2 Rymskogo-Korsakova Str., 40000 Sumy, Ukraine
$^{2}$Donetsk Institute for Physics and Engineering Named after O.O. Galkin, NAS of Ukraine, 46 Nauky Ave., UA-03680 Kyiv, Ukraine

Received: 06.12.2016. Download: PDF

The process of metals’ fragmentation due to treatment by methods of a severe plastic deformation is investigated within the scope of nonequilibrium evolutional thermodynamics. Reviewing approach allows identifying the main channels of energy dissipation in system. The phase diagram is obtained within the approximation of a two-defect model taking into account both dislocations and grain boundaries. It sets the conditions of formation of various types of limiting (stationary) structures. The kinetics of the evolution of density of each defects’ type is investigated. As shown, the stationary structures are formed depending on the initial values of defects’ density and the values of control parameters, which are elastic shear and compressive strains. The influence of the degree of interaction of two defect subsystems on kinetics process is established. As found, the change of system states has the nature of structural-phase transition. As it follows from description ways, the limiting (stationary) structure is not invariable. It is represented as dynamic equilibrium between the processes of generation and annihilation of structural defects.

Key words: grain boundary, dislocation, phase transition, phase diagram, internal energy.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i02/0265.html

DOI: https://doi.org/10.15407/mfint.39.02.0265

PACS: 05.70.Ln, 61.72.Lk, 61.72.Mm, 62.20.F-, 64.30.Ef, 81.20.Hy, 81.30.Bx, 83.10.-y

Citation: O. V. Khomenko, D. S. Troshchenko, and L. S. Metlov, Modelling of Kinetics of Modes of a Fragmentation of Materials at a Severe Plastic Deformation, Metallofiz. Noveishie Tekhnol., 39, No. 2: 265—284 (2017) (in Russian)

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