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1
Content available Explosive crystallisation of metal glasses based on Fe-B during pulsed laser heating. Experiment and modelling
Smolyakov O.V., Girzhon V.V., Mudry S.I., Nykyruy Y.S.
Archives of Materials Science and Engineering
|
2023
|
Vol. 119, nr 2
49--55
EN
Purpose: The structure evolution of amorphous metallic alloys during different kinds of thermal effects is an important problem of disordered systems physics. A precise evolutional model would allow predicting the formation of such a structural state, providing the necessary physical and mechanical alloy properties. Design/methodology/approach: The paper is devoted to the problem of modelling the explosive crystallisation process in metal glasses induced by laser, supplemented by experimental results. Findings: A theoretical model of laser-induced explosive crystallisation in metal glasses is proposed. A pulse laser heating method for the surface processing was developed, making it possible to obtain two-layer structures with an adjustable thickness of the amorphous crystalline layer. Research limitations/implications: The proposed model is assumed to test and optimes for metal glasses of other chemical compositions. Practical implications: A theoretical model of laser-induced explosive crystallisation in metal glasses allows for predicting and controlling structure changes to obtain the desired properties. Originality/value: The investigation of structure changes at rapid heating of amorphous alloys by experimental methods is very limited in obtaining data and their interpretation. For that reason, combining the modelling with experimental measurements is proposed. The results of this work have value for a scientist in material science, physics and engineering, which use nonequilibrium physical processes to obtain new materials, including nanoscale systems.
2
Content available The structure of clusters in liquid alloys of pseudo-binary PbTe-Bi2Te3 system
Korolyshyn A. V., Olyinyk Z. M., Mudry S. I.
Archives of Materials Science and Engineering
|
2019
|
Vol. 100, nr 1/2
5--12
EN
Purpose: of this paper is to study the structure of melts of quasi-binary system Bi2Te3-PbTe by means of X-ray diffraction method. The aim of the research was to investigate the short range order in melts comparing it with the structure in solid state. Design/methodology/approach: Analysis of the structural factors, radial distribution functions of atoms and basic structural parameters showed that the structure of melts at temperatures near the liquidus shows microheterogeneity. Findings: On the basis of the analysis of structural factors, functions of the radial distribution of atoms and basic structural parameters, it is shown that in the given concentration the short range order structure of liquid alloys of pseudo-binary PbTe-Bi2Te3 system is microinhomogeneous and is characterized by the presence of associates, whose atomic arrangement is like to the structure of solid compounds, existing in this concentration range. Research limitations/implications: To complete the understanding of short-range order effect on the formation of the physical properties of Pb-Bi-Te alloys, further studies of the thermoelectric properties of these alloys in the liquid state are needed. Practical implications: The promise of the considered direction requires an experimental and theoretical study of the processes of bulk, thin film and nanostructured material. In this case, it is necessary to develop a technology for the synthesis of compounds of Pb-Bi-Te system, obtaining thin films and nanostructures using the vapour phase methods with studying the mechanisms of thermoelectric properties of the material formation and optimization of technological regimes for obtaining effective thermoelectric materials based on compounds of Pb-Te-Bi system. Originality/value: The processes of structure formation of nanosystems with given characteristics are investigated, because among numerous thermoelectric materials, bismuth telluride (Bi2Te3) and its alloys are the most important thermoelectric materials used in state-of-the-art devices near room temperature, and lead telluride (PbTe)-based alloys are extensively used in power supplies for space exploration and generators for use at medium to high temperatures.
3
Content available remote The structural features of the amorphous C14 HfNiAl Laves phase
Mudry S. I., Shved O. V., Kulyk Yu.O., Bulyk I. I., Borysiuk A. K.
Archives of Materials Science and Engineering
|
2018
|
Vol. 89, nr 2
49--54
EN
Purpose: In order to clarify whether amorphization occurs in the pseudo-binary C14 HfNi0.6Al1.4 Laves phase a detailed investigation of the effect of hydrogen treatment on it phase-structural state has been studied. This type of compounds is of interest due to their high possibility to hydrogen absorption as Laves phase structures and as Hf-Ni alloys. Design/methodology/approach: We used a combination of hydrogen treatment and grinding methods for studying of the processes of controlled structure formation. High temperature transformations of the HfNi0.6Al1.4 alloy were pointed out by means of XRD analysis. Findings: By combination of two amorphization methods and high temperature measurements we have observed a phase structural transformation of the HfNi0.6Al1.4 alloy, which could be presented as: HfNi0.6Al1.4(cryst.) + H2 ® HfNi0.6Al1.4 (nanocryst.) + HfNi0.6Al1.4 (amorphous) + H2 ® HfH2 (amorphous) + AlH3 (amorphous) + Ni. Ferromagnetic- like properties of the pseudo-binary HfNi0.6Al1.4 Laves phase was found. Research limitations/implications: Complex research of HfNi0.6Al1.4 alloy revealed various structure features depending on phase content, thermodynamic parameters and conditions of hydrogen treatment. Obtained results suppose that further studies of structure and physical properties of Hf-Ni-Al alloys will allow to find the methods to control the producing of materials with desired properties. Practical implications: Using of hydrogen treatment is effective to produce Al-based alloys with improved magnetic properties. Originality/value: Treatment in hydrogen atmosphere allows improving the glass-forming ability in Hf-Ni-Al alloys.
4
Content available Variation of temperature field created at pulsed laser irradiation of amorphous Fe73.7Si15.5B7.4Nb2.4Cu1.0 alloy
Nykyruy Yu.S., Mudry S. I.
TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
|
2015
|
Vol. 19, No 1
75--82
EN
The temperature in the laser irradiation area of an amorphous iron-based ribbon was calculated. As a result of the calculation a spatial temperature distribution and its time dependence were structured which allowed reproducing the geometric and structural characteristics of exposed areas. Simultaneously, an irradiated amorphous alloy was investigated by scanning electron microscopy which allowed determining the geometric and structural characteristics of these areas experimentally and obtaining their dependencies on the laser pulse parameters. The results of theoretical calculations were compared with the experimental data.
5
Content available remote Laser induced structure transformation in Co70Fe3Mn3.5Mo1.5B11Si11 amorphous alloy
Mudry S. I., Nykyruy Yu.S.
Materials Science Poland
|
2014
|
Vol. 32, No. 1
28--33
EN
Laser induced structure changes in amorphous Co70Fe3Mn3:5Mo1:5B11Si11 alloy have been studied by means of X-ray diffraction and magnetic properties measurements. Both three types of structural relaxations and a starting stage of crystallization process are considered as main characteristics of structure transformation upon laser treatment. Results of investigation of this amorphous alloy at different parameters of laser irradiation have shown that this alloy becomes partly crystalline after irradiation with laser pulse fluence of about 1.8 J/mm2 and pulse duration t = 2 × 10-5 sec. Increasing of laser pulse fluence above 2.0 J/mm2 leads to the destruction of ribbon, due to intensive evaporation.
6
Content available remote Fe2+- and Er2+-intercalative modification of porous and electron structure of activated carbon and its influence on supercapacitor parameters
Venhryn B.Ya., Grygorchak I.I., Kulyk Yu.O., Mudry S.I., Strelchuk V V, Budzulyak S I, Dovbeshko G I, Fesenko O M
Materials Science Poland
|
2014
|
Vol. 32, No. 2
272--280
EN
An influence of both porous and electron structure on the processes in an electric double layer (EDL) determining the main working parameters of carbon-based supercapacitors has been studied in order to improve them. The investigations involved impedance spectroscopy, X-ray small angle scattering, confocal micro-Raman spectroscopy, infra-red and M¨ossbauer spectroscopy. Fe2+- and Er2+-intercallative modifications of nanoporous carbon were performed. It was found that the modification process characteristics correlated with the structure parameters of the EDL.
7
Content available remote Improvement of supercapacitor parameters by nickel ion intercalation into activated carbon
Venhryn B. Y., Grygorchak I. I., Kulyk Y. O., Mudry S. I.
Materials Science Poland
|
2013
|
Vol. 31, No. 1
126-132
EN
The relation between the porous structure and the electron structure in carbon materials was investigated in order to optimize the effiency of the physical-chemical processes in an electric double layer (EDL) formed at the boundary between the carbon material and the electrolyte (KOH 30 % aqueous solution). In particular, an Ni2+ intercalative modification of nanoporous carbon resulted in more than a triple increase in the specific capacitance and a significant improvement of the charge-discharge kinetics in the EDL.
8
Content available remote Influence of pulse laser irradiation on structure and mechanical properties of amorphous Fe73.1Nb3Cu1.0Si15.5B7.4 alloy
Mudry S.I., Nykyruy Yu.S., Kulyk Yu.O., Stotsko Z. A.
Journal of Achievements in Materials and Manufacturing Engineering
|
2013
|
Vol. 61, nr 1
7--11
EN
Purpose: The aim of this work was to study structure changes in Fe-based amorphous ribbon under laser radiation, determine it dependence from laser treatment parameters and establish the correlation between structure and microhardness. Design/methodology/approach: Amorphous ribbons of Fe73.1Nb3Cu1.0Si15.5B7.4 alloy, obtained by rapid cooling from the melt, has been treated by pulsed laser radiation with wavelength λ = 1.06 μm and pulse duration τ = 130 ns. Structure transformation has been studied by means of X-ray diffraction method, which allowed us to determine the phase composition, volume fraction and grain size of crystalline phases has been determined. Findings: It has been shown, that laser treatment method allows forming an amorphous-nanocrystalline composite. It was found that microhardness of ribbon increases after irradiation and linearly depends on percent of crystalline phase. Practical implications: Laser treatment can be used as an substitute of isothermal heat treatment to produce amorphous-nanocrystalline materials with improved properties. Originality/value: The originality of this work is based on applying of pulse laser irradiation for modifying structure of amorphous Fe73.1Nb3Cu1.0Si15.5B7.4 alloy.
9
Content available remote Effect of ultrasonic treatment of activated carbon on capacitive and pseudocapacitive energy storage in electrochemical supercapacitors
Venhryn B. Y., Grygorchak I.I., Stotsko Z. A., Bakhmatyuk B.P., Mudry S.I., Kulyk Yu.O.
Journal of Achievements in Materials and Manufacturing Engineering
|
2013
|
Vol. 60, nr 2
59--65
EN
Purpose: Use of ultrasonic radiation for improving the properties of activated carbon was the aim of this paper. Increase of density of states at Fermi level was the main factor, responsible for working characteristics of electrochemical supercapacitors. Design/methodology/approach: Working parameters of supercapacitors on the base of activated carbon have been studied by means of precisional porometry, small angle X-ray scattering, cyclic voltamerometry, electrochemical impedance spectroscopy and computer simulation methods. Findings: The possibility to effect the interface between activated carbon and electrolyte by means of ultrasonic treatment in cavitation and noncavitation regimes is proved. It is shown that ultrasonic treatment in noncavitation regimes causes the significant increase of density of states at Fermi level that results in better farad-volt dependences. Research limitations/implications: This research is a complete and accomplished work. Practical implications: Modification of electric double layer by meanans in ultrasonic treatment, proposed in this work, could be regarded as effective way to obtaine the advanced electrode materials in devices of energy generation and storage. Originality/value: This work is important for physics, material science and chemistry because it is related with new possibilities to change the mobility of charge carries in electric double layer by means of ultrasonic irradiation.
10
Content available remote Synthesis and X-ray structural investigation of undoped borate glasses
Padlyak B. V., Mudry S. I., Kulyk Y. O., Drzewiecki A., Adamiv V. T., Burak Y. V., Teslyuk I. M.
Materials Science Poland
|
2012
|
Vol. 30, No. 3
264--273
EN
A series of undoped borate glasses: Li2B4O7, LiKB4O7, LiB3O5, SrB4O7, and LiCaBO3 of high optical quality and chemical purity were obtained from the corresponding polycrystalline compounds using standard glass synthesis under technological conditions developed by the authors. The glasses were obtained by rapid cooling of molten crystalline material, which was heated to 100 K above the melting point to prevent crystallization and to exceed the glass transition point. The X-ray diffraction intensity profiles of the investigated glasses were typical of glassy compounds. The most typical intensity profile, consisting of almost symmetrical peaks, was observed in the case of Li2B4O7 and LiB3O5. Substitution and partial substitution of Li atoms by Sr and Ca atoms was accompanied by significant changes in the intensity profiles of the investigated glasses. Pair correlation functions and structural parameters (average interatomic distances and coordination number to oxygen) of the investigated glasses were evaluated and analyzed. Structural peculiarities of the investigated borate glasses are discussed in comparison with structural data available for their crystalline analogs.
11
Content available remote Scanning thermoelectric and acoustic emission diagnostic of structural inhomogeneities of thermocouple materials
Prokhorenko V. J., Prokhorenko S. V., Mudry S. I., Sheregii E. M., Dominjuk T. I.
Archives of Foundry Engineering
|
2010
|
Vol. 10, iss. 1 spec.
381--386
EN
New method for diagnostic of constructional and functional materials by means of thermoelectric and acoustic- emission measurements is proposed. The method allows not only to establish the defect location, but its partial temperature relaxation achieve.
12
Content available remote The structure of Ni-enriched Al-Ni molten alloy before solidification
Bojar Z., Kazimirov V. P., Mudry S. I., Prokhorenko W. J., Prokhorenko S. W., Jóźwik P.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 2
93-96
EN
The structure of Ni-based molten alloy, containing 88,02w.%Ni and dopped both with Zr (0,46w.%) and B (0,02w.%) has been studied by means of X-ray diffraction method at temperature 1500 K. Structure factor and pair correlation function were obtained from diffraction data and analyzed. Principal peak position in structure factor for doped molten alloy is compared with one for liquid Ni3Al intermetallics. Another structural parameters-most probable interatomic distance and number of neighbours have been also determined from pair correlation function and compared with parameters of crystalline structure for Ni3Al chemical compound. The structure data are interpreted with using of cluster models of metallic melts.
13
Content available remote Porous structure of carbon-based materials studied by means of X-ray small angle scattering method
Venhryn B.Ya., Grygorchak I.I., Kulyk Yu.O., Mudry S.I., Shvets R.Ya.
Optica Applicata
|
2008
|
Vol. 38, nr 1
119-125
EN
The porous structure of carbon-graphite materials: styrene-divinylbenzene copolymer (SBC) and fruit stones (FS) has been studied by means of X-ray small angle scattering method. The angular dependences of scattered intensities have been obtained and analyzed by means of the Guinier method. The main parameters of porous structure have been determined (inertia radius, pore size distribution functions, specific surface areas).
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