The External Periodic Influence Effect on the Kinetics of Metals Fragmentationduring the Severe Plastic Deformation

Authors A.V. Khomenko , D.S. Troshchenko , D.V. Boyko , M.V. Zaharov

Sumy State University, 2, Rimsky Korsakov Str., 40007 Sumy, Ukraine

Issue Volume 7, Year 2015, Number 1
Dates Received 12 December 2014; published online 25 March 2015
Citation A.V. Khomenko, D.S. Troshchenko, D.V. Boyko, M.V. Zaharov, J. Nano- Electron. Phys. 7 No 1, 01039 (2015)
PACS Number(s) 05.70. – a, 61.72.Mm, 61.72.Lk, 62.20.F –, 64.10. + h, 64.60.My, 68.35.Md, 83.10. – y
Keywords Grain boundary, Dislocation (9) , Limiting structure, Phase transition (6) , Phase diagram, Internal energy, Fragmentation (2) .
Annotation Using the Landau theory of phase transitions, the solids fragmentation during the process of severe plastic deformation is studied. The density of grain boundaries, dislocations and entropy are introduced for describing the defect structures appearing. This allows us to take into account the two channels of energy dissipation (thermal one and defects formation). The phase diagram that establishes the domains of realization of different limiting structures types is obtained. The interaction of several defect types on the formation of limiting structure in terms of internal energy is studied. The formation conditions for two limiting structures are found. They correspond to the mode, in which there is a mixture of different grain sizes. The kinetics of setting in the steady-state values of the defects density is investigated within the scope of the adiabatic approximation, at which the dislocations density change follows the evolution of the grain boundaries density. The external periodic influence is also analyzed. It is shown that frequency and amplitude of external influence change the system behavior.

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