Перегляд за автором "Boyko, Yu.I."

Результати 1-10 з 10

Contact relaxation phenomena in nano-structured composite materials

Boyko, Yu.I.; Volosyuk, M.A.; Volosyuk, A.V.; Rokhmanov, N.Ya. (Functional Materials, 2015)

There are discussed physical mechanisms of some effects related to both nano-material granularity and existence of the strongly branched contact area separating the nano-size grains. In the area the relaxation processes ...
Creep of the Ti₃AlC₂ MAX-phase ceramics

Boyko, Yu.I.; Bogdanov, V.V.; Gevorkyan, E.S.; Vovk, R.V.; Korshak, V.F.; Kolesnichenko, V.A. (Functional Materials, 2019)

The process of plastic deformation of multicomponent ceramics based on the MAX phase at room temperature and at higher (1000 °C) temperature has been studied by dilatometry and microindentation. Based on the experimentally ...
Dislocation-diffusion mechanism of high-temperature healing of the cracks in crystals under loading

Boyko, Yu.I.; Volosyuk, M.A.; Kononenko, V.G. (Functional Materials, 2012)

The regularities of disc-like voids (cracks) healing in polycrystalline copper samples under conditions of uniaxial compression at 600°C were experimentally studied. The theory of crack healing by diffusion-dislocation ...
Formation mechanisms and geometry of the crack assemble formed under uniaxial cyclic compression of NaCl single crystals

Boyko, Yu.I.; Volosyuk, M.A.; Kononenko, V.G. (Functional Materials, 2012)

Using light-scattering method, the cracks formation was experimentally studied in NaCI single crystals under uniaxial cyclic compression (10⁷ N/m²) during ~10 c at room temperature and following annealing at T = 500°C for ...
Kinetics for dislocation structure formation in contact area of squeezed crystalline solids

Boyko, Yu.I.; Volosyuk, M.A.; Kononenko, V.G. (Functional Materials, 2013)

Evolution of dislocation structure during formation of the contact area was studied in modeling experiments "wedge-plane" for KCl single crystal under loading at room and high (0.8Tm) temperatures. It was shown that at the ...
Mechanisms of local inhomogeneity of dopant concentration in Y₂SiO₅:Pr³⁺ nanocrystals

Seminko, V.V.; Masalov, A.A.; Malyukin, Yu.V.; Boyko, Yu.I. (Functional Materials, 2010)
Mechanisms of microvoid formation within KCl single crystals in the pulse energy release area of laser focused radiation

Boyko, Yu.I.; Volosyuk, M.A.; Kononenko, V.G. (Functional Materials, 2012)

Mechanism of micropore formation in the area of pulse energy release of the laser focused radiation in KCI single crystals was studied experimentally at low (77 K) and room (300 K) temperatures. The pulse duration was ...
Spectroscopically detected segregation of Pr³⁺ ions in YPO₄:Pr³⁺ nanocrystals

Seminko, V.V.; Maksimchuk, P.O.; Kononets, N.V.; Masalov, A.A.; Boyko, Yu.I.; Malyukin, Yu.V. (Functional Materials, 2012)

Segregation of Pr³⁺ ions in YPO₄:Pr³⁺nanocrystals was revealed by means of spectroscopic techniques. Increase of doped ions concentration in the near-surface layer of YPO₄:Pr³⁺ nanocrystals was confirmed by modification ...
Structural rearrangement and change of cerium valence in cerium dioxide (CeO₂) nanocrystals

Boyko, Yu.I.; Seminko, V.V.; Maksimchuk, P.O.; Malyukin, Yu.V. (Functional Materials, 2016)

For CeO₂ nanocrystals a large number of cerium ions undergo Ce⁴⁺→ Ce³⁺ transition leading to formation of oxygen-deficient CeO₂₋x phase in the subsurface layer of nanocrystal. Such structural rearrangement leads to density ...
Thermal and crack resistance of ceramics based on the MAX phase Ti₃AlC₂

Boyko, Yu.I.; Bogdanov, V.V.; Vovk, R.V.; Gevorkyan, E.S.; Kolesnichenko, V.A.; Korshak, V.F.; Prikhna, T.A. (Functional Materials, 2018)

The paper discusses the conditionality of such physical properties of polycomponent oxygen-free ceramics (MAX phases), as thermal and fracture resistance, with a special physicochemical nature of the binding forces between ...

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Перегляд за автором "Boyko, Yu.I."

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