MICROSTRUCTURE AND PHASE TRANSFORMATIONS IN THE ODS ALLOYS IRRADIATED BY SWIFT HEAVY IONS

Microstructure of KP4 ODS alloy irradiated with 700 MeV bismuth ions at 300K has been studied using high resolution transmission electron microscopy. No latent tracks have been observed in Y4Al2O9 particles in KP4 irradiated with Bi ions. Small oxides (~ 5 nm) in KP4 alloy remain crystalline at Bi ion fluence 1.5×1013 cm-2, while subsurface regions in large (~ 20 nm) particles faced to the beam entrance became amorphous

ACILE SOL-GEL SYNTHESIS OF METAL OXIDE NANOPARTICLES IN A CELLULOSE PAPER TEMPLATE

Ensembles of free standing particles of titanium, zinc, copper and iron oxides of 6-109 nm in size were sol-gel synthesized with a use of a cellulose paper as a template. The calcination time as short as 60 min at 550 °C in air was found to be sufficient for the formation of crystalline single phase TiO2 or ZnO nanoparticles, Cu2O+CuO or Fe2O3+Fe3O4 nanocomposites and to burn out the organic components. The impurities initially present in the cellulose (Сa, Na, Cl) were detected in the synthesized compounds. The original version of the paper was stolen by James Franklin and on-line published with the cut list of the authors in Journal of Nanomedicine and Nanotechnology 2017 without author permission

Radiation Swelling and Hardness of High-Entropy Alloys Based on the TiTaNbV System Irradiated with Krypton Ions

The aim of this work is to study the effect of irradiation with low-energy Kr14+ ions with an energy of 280 keV on radiation swelling and a decrease in the strength characteristics of high-entropy alloys based on the TiTaNbV system. The prospects of these studies are due to the possibility of obtaining new data on the radiation resistance of high-entropy alloys, which have great potential for use as structural materials for new-generation reactors. The choice of this type of irradiation and a dose of 5 × 1015 Kr/cm2 made it possible to simulate the effect of radiation swelling arising at a displacement per atom of 30–50 dpa in a small surface layer no more than 100–150 nm thick. During the studies carried out, it was found that the formed medium- and high-entropy alloys TaNbV and TiTaNbV have increased resistance to swelling and deformation of the crystal structure. At the same time, alloys of the NbV and TaNbV type have the highest degree of resistance to softening, while the TiTaNbV alloy has a lower resistance to swelling, since the addition of titanium leads to a decrease in the density and hardness of the alloy. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature

Latent tracks of swift Bi ions in Si3N4

Parameters such as track diameter and microstruture of latent tracks in polycrystalline Si3N4 induced by 710 MeV Bi ions were studied using TEM and XRD techniques, and MD simulation. Experimental results are considered in terms of the framework of a 'core-shell' inelastic thermal spike (i-TS) model. The average track radius determined by means of electron microscopy coincides with that deduced from computer modelling and is similar to the track core size predicted by the i-TS model using a boiling criterion. Indirect (XRD) techniques give a larger average latent track radius which is consistent with the integral nature of the signal collected from the probed volume of irradiated material. © 2020 The Author(s). Published by IOP Publishing Ltd

Sol-gel fabrication of zinc oxide nanostructured coatings on a fiberglass tissue

Nanostructured zinc oxide coatings were for the first time fabricated by sol-gel technique on a fiberglass tissue. The coatings have demonstrated high catalytic activity in UV light assisted decomposition of Rhodamine B

Drastic structure changes in pre-damaged GaAs crystals irradiated with swift heavy ions

We have studied structural transformations in pre-damaged GaAs crystals irradiated with high-energy Bi ions (710 MeV, 4.3 x 1012cm-2). The pre-damage has been created via irradiation with swift electrons (4 MeV, 4 x 1017cm-2). A structural disorder in irradiated samples has been investigated by means of selective chemical etching (SCE) and X-ray diffraction (XRD) in combination with the material layer-by-layer removal. Character of lattice deformation in the double-irradiated sample gives an evidence of subsurface region’s swelling. Strong lattice distortion has been found in the region of Bi ion ranges at the depth of about 30 lm. The nature of this effect is discusse

Phase Composition Stability of ZrN/SiNх Multilayered Coatings under Air Annealing: the Role of the Thicknesses Ratio of the Elementary Layers

Секция 5. Влияние излучений на структуру и свойства покрытий = Section 5. Radiation Influence on Coatings Structure and PropertiesIn the present work the phase composition stability and oxidation resistance of ~300 nm thick ZrN/SiNx nanoscale multilayers at the air annealing procedure were studied. Coatings were prepared by reactive magnetron sputter-deposition on Si wafers under Ar+N2 plasma discharges. ZrN/SiNx multilayers with ZrN and SiNx layer thickness varying from 2 to 10 nm were synthesized by sequential sputtering from elemental Zr and Si3N4 targets at T dep =300 °C. According to X-ray diffraction (XRD) analysis the multilayered films consist of nanocrystalline (002)-oriented ZrN and amorphous SiNx layers. The oxidation resistance under air was studied using in situ XRD in the temperature range from 400 to 950 °C, as well as by scanning electron microscopy (SEM) and wavelength dispersive X-ray spectrometry (WDS) after air annealing procedure. While the reference ZrN film starts to oxidize at Tox. = 550 °C, a much higher oxidation resistance is found for multilayered films, till Tox. = 860–950 °C for ZrN/SiNx coatings with the elementary layer thickness ratio of 5 nm/10 nm and 2 nm/5 nm

BUAD 207: Human Resource Management

Секция 5. Влияние излучений на структуру и свойства покрытийQuaternary TiZrAlN films were grown at Ts=600°C by reactive magnetron sputtering in Ar+N2 plasma discharge from elemental targets. Deposition occurred at the constant power of Ti and Zr targets, while changing the Al power and adjusting the N2 flow rate, resulting in stoichiometric nitride films (N concentration ~ 50 at.%) with Al content up to 37 at.% and fixed Zr:Ti ratio of 1:1. It is shown that single-phase, cubic (Ti,Zr)1-xAlxN solid solutions are stabilized upon incorporation of Al. The lattice parameter of Al-containing films linearly decreases with the increase in Al concentration. For these films the maximum hardness (25 GPa) is achieved at Al content of 19 at.

Drastic structure changes in pre-damaged GaAs crystals irradiated with swift heavy ions

We have studied structural transformations in pre-damaged GaAs crystals irradiated with high-energy Bi ions (710 MeV, 4.3 x 1012cm-2). The pre-damage has been created via irradiation with swift electrons (4 MeV, 4 x 1017cm-2). A structural disorder in irradiated samples has been investigated by means of selective chemical etching (SCE) and X-ray diffraction (XRD) in combination with the material layer-by-layer removal. Character of lattice deformation in the double-irradiated sample gives an evidence of subsurface region’s swelling. Strong lattice distortion has been found in the region of Bi ion ranges at the depth of about 30 lm. The nature of this effect is discusse