Department of High-Pressure Physics and Promising Technologies
Head of the Department: Victor N.Varyukhin,
doctor of physico-mathematical sciences, professor
Directions of Scientific Researches: Investigation of the influence of intensive plastic deformations, high pressures and concentrated energy flux on solids structure and properties.
There has been suggested and developed a new method of plastic metal working a screw extrusion which makes possible ultrafine-crystalline and nano-crystalline structures in three-dimensional samples both by grain grinding (fragmentation) in large crystalline materials and by consolidation of amorphous and nano-crystalline powders. The method opens up fresh opportunities for study of solids structure evolution during intensive plastic deformation under pressure.
We pioneered in demonstrating that stepping-up of pressure in the point of intensive plastic deformation results not only in the suppression of a material failure, but also in the fragmentation rate increase.
On the base of the mathematical modeling, there has been predicted a possibility of increasing metal plasticity after a large enough deformation under pressure.
There have been obtained ultrafine-crystalline and nano-crystalline samples of Al-, Ti-, Cu- and Fe-based alloys.
There have been determined optimal deformation conditions of high-nitride steels under pressure making for the production of a high complex of strength and plastic properties. This work was given the G.V. Kurdyumov bonus of the National Academy of Sciences of Ukraine in 2002.
There has been developed a technology of increasing a technological plasticity of secondary aluminum alloys based on the use of the screw extrusion method.
The Institutes of the NAS of Ukraine: the Institute of Metal Physics, the Institute of the Materials Science Problems, the Institute of Super-Solid Materials, the Institute of Metallurgy and Materials Science of the RAS (Moscow, Russia), the Institute of Physics of Metals of the Ural Department of the RAS, the Institute of Electric Physics of the Ural Department of the RAS, the Institute of the Science of Machines of the Ural Department of the RAS (Ekaterinburg, Russia), the Institute of Problems of Super-plasticity of Metals and alloys (Ufa, Russia), Ural State Technical University, Ural State University (Ekaterinburg, Russia), the Institute of Physics of Promising Materials at USATU (Ufa, Russia); Los Alamos National Laboratory General Electric Company, Clemson University (USA); Solid Mechanics Laboratory CNRD, Department of Mechanics Ecole polytechnique; Laboratoire de Physique et Mecanique des Materiaux Universite de Metz (France); Institute of Fundamental Technological Problems of PAN (Poland).
1. Y.E. Beygelzimer. Grain refinement versus voids accumulation during severe plastic deformations of polycrystals: mathematical simulation. Mechanics of Materials 37, 753 (2005).
2. M.M.Savosta, V.N.Krivoruchko, I.A.Danilenko, V.N.Varyukhin, V.Yu.Tarenkov, T.E.Konstantinova. Nuclear spin dynamies and magnetic structure of nanosized particles of La0.7Sr0.3MnO3. Phys. Rev.B. 69, 024413 (2004).
3. R.V.Shalaev, V.N.Varyukhin, A.M.Prudnikov. Influence of UV-radiation on structure and proerties of diamondlike a-C: N films. Functional Materials 3 (11), 617 (2004).
4. I.M.Fita, R.Szymczak, M.Baran, V.Markovich, R.Puzniak, A.Wisniewski, C.V.Shiryaev, V.N.Varyukhin and H.Szymczak. Evolution of ferromagnetic order in LaMnO3.05 single crystals: Common origin of both pressure and self-doping effects. Phys. Rev.B. 68 014436 (2003).
5. Ya.E.Beygelzimer, V.N.Varyukhin, D.V.Orlov, S.G.Synkov. Screw extrusion a process of deformation accumulation. Donetsk: TEAN, 85 (2003).
6. B.M.Efros, V.P.Pilyugin, S.V.Gladkovskii. Pressure influence on solid phase transformation in metals and alloys after severe plastic deformation. Defects and Diffusion Forum 208, 263 (2002).