Department of Technological Studies of Hydroextrusion Processes
Head of the Department: Victor A.Beloshenko,
doctor of sciences
Directions of Scientific Researches: High-pressure physics and engineering. Physics of Strengthening and Plasticity. Physical Materials Science.
There have been developed regularities of changing structure and properties of a series of metals, alloys, polymer and composite materials because of large plastic deformations under a high pressure, of an inheritance influence of deformation on structural and phase transformations on a heat exposure. The revealed effects of the material treatment by hydro-extrusion and hydrostatic drawing allowed radically new ways of developing promising technologies to be suggested. There have been determined regularities of the formation of an extremely high level of strength of structural and tool steels (in particular, austenitic, maraging, high-speed, die ones), high-temperature and heavy alloys. It has been shown that the texture formation under hydroextrusion makes it possible to reach an extremely high level of magnetic properties of polycrystalline low-temperature ferromagnetics. There have been found the mechanisms of a strain hardening under high pressures of fibrous composites; there has been also revealed an intensive increase of their strength in the range of fiber nano-sizes meeting an ultimate level as the sizes of fibers and matrix interlayers between them decrease up to 10-15 nm. There has been found out a possibility and determined the mechanisms of a fiber structure of metals in the process of a package hydroextrusion of samples.
There have been revealed regularities of a sub-microcrystalline structure formation and of changing properties of materials in the course of realization of an intensive plastic deformation by a multi-angular equally channel extrusion of samples. There have been studies peculiarities of a structural modification of polymers and polymer composites induced by a high pressure. There have been determined the mechanisms of realizing the shape memory effect in polymer composites accompanied by a volume increase.
There have been developed mathematical models of nano-structural materials, of processes of a multi-angular equally channel extrusion, of powder electric sintering.
There have been developed the ways and devices for a multi-angular equally channel extrusion allowing a realization of intensive plastic deformations and formation of a sub-microcrystalline structure of high-strength metals and alloys. With the help of a package hydroextrusion and hydrostatic drawing there have been obtained long wire articles of copper of a fibrous structure and composite on the base of copper with niobium-titanium fibers of a record strength level. There have been developed the production conditions from powder composites, including nano-powders, high-dense samples by electric-charge sintering and plastic deformation under a high pressure. There has been developed a set of equipment for a structural modification of polymer articles using high hydro-static pressures.
The Institute of the NAS of Ukraine: the Institute of the Materials Science Problems, the Institute of CM, the Physico-Technical Institute of MC, the Institute of Electric Welding, the Institute of Physics of Metals, the Institute of Ferrous Metals, the Scientific and Engineering Complex ôInstitut monokristallovö; the Scientific Centre ôThe Kharkov Physoco-Technical Instituteö; Universities: Donetsk National University. Donetsk National Technical University, Natinal University ôThe Kiev Polytechnic Instituteö Kharkov National University and others; the institute of the Russian Academy of Sciences and higher schools of the Russian Federation.
1. V.A.Beloshenko, V.N.Varyukhin, Y.V.Voznyak. Electrical properties of carbon-containing epoxy compositions under shape memory effect realization. Composites 36A, 65 (2005).
2. V.A. Beloshenko, V.N.Varyukhin, Yu.V.Voznyak. The shape memory effect in polymers. Uspehi himii 74, 285 (2005).
3. V.N. Varyukhin, V.Z.Spuskanyuk, N.I.Matrosov, A.B.Dugadko, B.A.Shevchenko, E.A.Medvedskaya, L.F.Sennikova, A.V. Spuskanyuk, E.A.Pavlovskaya. An equally channel multiangular extrusion. Fizika I tehnika vysokih davlenii 12 (4), 31 (2002).
4. V.Z.Spuskanyuk, N.I.Matrosov, E.A.Pavlovskaya, L.F.Sennikova, A.B.Dugadko. On the character of a component interface influence on a fibrous composite strength. Problemy prochnosti 5, 94 (2001).
5. B.G.Lazarev, L.S.Lazareva, N.A.Chernyak, A.A.Chupikov, P.A.Kutsenko, B.K.Pryadkin, V.Z.Spuskanyuk, I.M.Kovalenko. Extremely high properties of low-temperature ferromagnetics, hydroextruded dysprosium and holmium. Fizika metallov i metallovedenie 86 (3), 46 (1998).
6. V.A.Beloshenko, A.A.Askadsky, V.N.Varyukhin. Promising directions of a structural modification of polymers and polymer composites with the use of high pressures. Uspehi himii 67, 1044 (1998).