A5081696317- Quasicrystal Structures and Properties
- Fusion materials and technologies
- Nuclear Materials and Properties
- X-ray Diffraction in Crystallography
- Mineralogy and Gemology Studies
- Intermetallics and Advanced Alloy Properties
- Laser-Plasma Interactions and Diagnostics
- Ion-surface interactions and analysis
- Chalcogenide Semiconductor Thin Films
- Advanced materials and composites
- Radiation Shielding Materials Analysis
- Thermal and Kinetic Analysis
- Magnetic confinement fusion research
- Advanced Power Generation Technologies
- Extraction and Separation Processes
- ZnO doping and properties
- Advanced X-ray and CT Imaging
- Copper-based nanomaterials and applications
- Eurasian Exchange Networks
- Graphite, nuclear technology, radiation studies
- Astronomical and nuclear sciences
- nanoparticles nucleation surface interactions
- Advanced Semiconductor Detectors and Materials
- Advanced Materials Characterization Techniques
- Material Science and Thermodynamics
National Technical University "Kharkiv Polytechnic Institute"
2016-2024
The synergistic effects of tungsten exposure to combined hydrogen and helium particle fluxes need be extensively studied for the realization a fusion reactor project. Sintered samples were irradiated with plasma generated by Quasi-Stationary Plasma Accelerator (QSPA) (He) ion beam. irradiation He ions 4 MeV resulted in formation compressive residual stresses an increase number dislocations. In contrast, development tensile cracks on sample surface was identified as main feature QSPA pulsed...
The damage of deformed double forged pure tungsten (W) and alloyed with 5 wt% tantalum (WTa5) have been studied in experimental simulations ITER-like transient events relevant surface heat load parameters (energy density up to 0.75 MJ/m2 the pulse duration 0.25 ms) as well particle loads (varied wide range from 1023 1027 ion/m2 s) quasi-stationary plasma accelerator QSPA Kh-50. exposures were performed for targets maintained at room temperature preheated 200 °C. either no melting W or above...
This paper is devoted to plasma–surface interaction issues at high heat-loads which are typical for fusion reactors. For the International Thermonuclear Experimental Reactor (ITER), now under construction, knowledge of erosion processes and behaviour various constructional materials extreme conditions a very critical issue, will determine successful realization project. The most important (PSI) effects in 3D geometry have been studied using QSPA Kh-50 powerful quasi-stationary plasma...
The temperature dependence of electrical resistivity in the range from 4.4 to 300 K for Ti41Zr41Ni18 (at.%) thin coatings various crystal perfection and phase compositions has been investigated. films were deposited by magnetron sputtering method. following vacuum annealing modes provided several combinations film phases such as 1/1 2/1 crystal-approximant phases, quasicrystalline icosahedral phase, Laves (Ti,Zr)2Ni α-Ti(Zr) solid solution phase. structure composition before after studied...
Influence of powerful plasma impacts on several materials used for the construction energy systems, i.e. different grades steels as well tungsten coatings, has been discussed. Irradiations these with hydrogen and helium streams have performed in high-current-pulse quasi-stationary accelerators which provided variation a power load upon exposed surface changes particle flux wide ranges: density range 1-25 MJ/m2, - up to 1026-1029 ion/m2s, stream velocity about 500 km/s, pulse duration 1-250 μs.
Compton to Rayleigh scattering intensity ratios ( I C / R ) have been measured using X‐rays with energy 17.44 keV for single‐component materials atomic number Z from 4 (Be) 31 (Ga) and binary compounds of stoichiometric composition. The measurements performed two optical schemes: an energy‐dispersive X‐ray fluorescence scheme a molybdenum secondary target wavelength‐dispersive one. processing the spectra was carried out by fitting Pearson VII functions. For standards, experimental dependence...
The structural state, stress, and substructure parameters of ribbons obtained by rapid solidification from the liquid state Ti41.5Zr41.5Ni17 alloy powders deformation were investigated using X-ray diffraction SEM microscopy methods. influence sample preparation such as quenching rate intensity deformation, on content quasicrystalline phase crystalline approximant (W-phase), is considered. It noted that volume W-phase increases with higher decreases rate. Accumulation specific defects in...
This paper presents the results of fabricating a model sample multilayer coating on Al2O3 substrate, which consisted 30 periods alternately deposited 10.5-nm-thick layers Ti41Zr41Ni18 and 2.5-nm-thick W. The effect annealing for 1 h at 500, 600, 700 °C was studied. Characterization phase structural state by X-ray diffractometry small-angle reflectometry carried out. It found that during process, tungsten in composition did not undergo significant changes, all alterations occur only layers....
The temperature dependence of the electrical resistivity in range from 4.4 to 300 K for Ti41Zr41Ni18 (at. %) thin coatings different crystal perfection and phase composition was studied. were deposited by magnetron sputtering with subsequent vacuum annealing various modes ensuring formation several heterophase combinations, which included 1/1 2/1 approximation phases, a quasicrystalline icosahedral phase, Laves (Ti, Zr)2Ni, an α-Ti (Zr) solid solution. structure before after studied X-ray...
The influence of pulsed helium plasma irradiation, with a 10 s duration and surface energy load 0.2 MJ m -2 , on the elemental phase composition, morphology crystal structure thin-film heterosystems based CdS/CdTe was studied.The cadmium sulphide telluride layers were deposited by condensation via hot wall method onto glass substrate covered an FTO layer.It found that after one pulse, device remains in working condition.An increase irradiation dose leads to sputtering, formation through...
X-ray diffraction and SEM microscopy were used to study structural phase changes in the surface layers of a Ti41.5Zr41.5Ni17 alloy bulk sample (target) thin film (deposited by magnetron sputtering target) under radiation-thermal action pulsed hydrogen plasma with thermal load 0.6 MJ/m2 QSPA Kh-50 installation. It is established that irradiation results formation two-phase state: icosahedral quasicrystalline together 1/1 approximant crystal (W-phase). As result isothermal (550⁰C) annealing,...
The cracking thresholds were evaluated for tungsten samples with different microstructure in the course of QSPA Kh-50 repetitive plasma loads. No damage has been observed on exposed surfaces under 0.1 MJ/m2. Nevertheless, cracks detected bulk irradiated (with longitudinal grain orientation). Increasing heat load up to 0.2 MJ/m2 caused damaging all types targets. propagate mainly transversely and parallel surface. effect subsequent exposure LHD divertor was analyzed. obtained results are discussed.
The screening parameter (Z‐ S ) of a self‐consistent field 1 s electrons was experimentally determined for Be, B, and C atoms with the number Z ≤ 9 included in LiF, Li 2 CO 3 , 4 B O 7 C, H O, 6 compounds. determination made by experimental dependence ratio intensities Rayleigh Compton scattering on momentum transfer variable range from 0.70 to 1.67 Å −1 . For single‐component materials, ( Z‐S values correspond theoretical free atoms. bonded compound, value depends composition compound...
The positions of the figurative points on triangular Gibbs phase diagram for process high-temperature synthesis solid solutions LiyNi2−yO2 were determined first time using a combination x-ray diffraction (XRD) and Compton scattering methods. trajectory point is built according to experimental data temperatures 650 750 °C. ratios phases in equilibrium are found. It was established that, when structure goes from rock salt layered structures, composition reagent mixture changes...
The properties of Ti41Zr38.3Ni20.7 thin films under radiation-thermal action hydrogen plasma with a surface heat load 0.2 MJ/m2 was studied at the QSPA Kh-50 quasi-stationary accelerator (NSC KIPT).The phase composition, structural state, and morphology were using X-ray diffraction scanning electron microscopy. It found that quasicrystalline related crystalline phases, Laves phase, α-solid solution, 2/1 Ti-Zr-Ni approximant crystal stable irradiation up to 20 pulses. composition did not...
Experimental studies of surface modification Eurofer samples have been performed with a quasi-stationary plasma accelerator QSPA Kh-50. The heat load on the was near tungsten melting threshold (i.e. about 0.6 MJ/m2). streams exposures result in steel-based materials and formation cellular submicron structures re-solidified layers. Phase characterized by body-centered cubic lattice appeared due to recrystallization affected material.
X-ray diffraction and SEM microscopy were used to study the structural phase changes in a thin film obtained by magnetron sputtering of Ti52Zr30Ni18 target (at.%) on steel substrate under radiation-thermal influence pulsed hydrogen plasma an QSPA Kh-50 accelerator. A technique has been worked out for formation quasicrystalline crystal-approximant phases as result high-speed quenching using action with heat load 0.6 MJ/m2. The contents these well their structure substructure parameters...