Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242008
O. Shkoda
The paper represents the experimental study of a titanium and nickel powder mixture subjected to mechanical activation (MA), followed by the self-propagating high-temperature synthesis (SHS) in the mode of thermal explosion with the formation of a synthesized product. This system is investigated as a self-consistent system. The formation of agglomerates during MA, the temperature characteristics of thermal explosion, and the composition of the synthesized product are studied. The MA times for obtaining the main events in the system, the optimal MA times for obtaining the compositions of a certain phase, and the corrected limiting values for the operation of the system are found. The inheritance of the behavior of each subsystem is revealed in the further steps to obtain a synthesized product.
{"title":"Using the Wavelet Transform for Mechanical Activation and Thermal Explosion of a Ti-Ni Mixture","authors":"O. Shkoda","doi":"10.1109/EFRE47760.2020.9242008","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242008","url":null,"abstract":"The paper represents the experimental study of a titanium and nickel powder mixture subjected to mechanical activation (MA), followed by the self-propagating high-temperature synthesis (SHS) in the mode of thermal explosion with the formation of a synthesized product. This system is investigated as a self-consistent system. The formation of agglomerates during MA, the temperature characteristics of thermal explosion, and the composition of the synthesized product are studied. The MA times for obtaining the main events in the system, the optimal MA times for obtaining the compositions of a certain phase, and the corrected limiting values for the operation of the system are found. The inheritance of the behavior of each subsystem is revealed in the further steps to obtain a synthesized product.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115462174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241915
P. Butyagin, S. Arbuzova, A. Kondratenko, A. Bolshanin
The influence of microarc oxidation (MAO) parameters of pulse duration of 100 µs, 200 µs, 400 µs, frequencies of 50 Hz, 70 Hz, 100 Hz, voltage of 350 V, 450V, 600V, and MAO time on the characteristics of coatings was studied. The morphology and composition of coatings are investigated. It is shown that the largest change in the morphology and composition has the coating with a thickness of 70 µm, formed under the MAO mode, frequency of 70 Hz, duration 200 µs, 600 V. The control of the MAO parameters leads to a change in the mechanism of coating formation.
{"title":"Influence of Anodic Spark Mode Parameters on the Properties of MAO-Coatings","authors":"P. Butyagin, S. Arbuzova, A. Kondratenko, A. Bolshanin","doi":"10.1109/EFRE47760.2020.9241915","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241915","url":null,"abstract":"The influence of microarc oxidation (MAO) parameters of pulse duration of 100 µs, 200 µs, 400 µs, frequencies of 50 Hz, 70 Hz, 100 Hz, voltage of 350 V, 450V, 600V, and MAO time on the characteristics of coatings was studied. The morphology and composition of coatings are investigated. It is shown that the largest change in the morphology and composition has the coating with a thickness of 70 µm, formed under the MAO mode, frequency of 70 Hz, duration 200 µs, 600 V. The control of the MAO parameters leads to a change in the mechanism of coating formation.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124977090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241987
B. Kozlov, D. Makhan'ko, V. Seredinov
A new design of high-voltage pulse generator which working at pulse repetition rates in diapason $1div 10 text{kHz}$ is proposed. Pulse generator ensure maximal values of pulses $150div 200 text{kV}$ with rise time about $20div 40$ nanoseconds and storage energy per pulse up to $5div 8 mathrm{J}$. Such parameters were achieved by combination of two cascade Marx generator with low inductance pulse transformer. Application this pulse generator to excitation of super-atmospheric pressure CO2 laser demonstrated its reliability at the pulse repetition rates up to 5 kHz at total pressures of CO2:N2:He mixtures $1div 5 text{atm}$.
{"title":"A New Design of High-Voltage Pulse Generators for Ignition of Volume Discharges at Super-Atmospheric Pressures in a Pulse-Periodical Regime","authors":"B. Kozlov, D. Makhan'ko, V. Seredinov","doi":"10.1109/EFRE47760.2020.9241987","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241987","url":null,"abstract":"A new design of high-voltage pulse generator which working at pulse repetition rates in diapason <tex>$1div 10 text{kHz}$</tex> is proposed. Pulse generator ensure maximal values of pulses <tex>$150div 200 text{kV}$</tex> with rise time about <tex>$20div 40$</tex> nanoseconds and storage energy per pulse up to <tex>$5div 8 mathrm{J}$</tex>. Such parameters were achieved by combination of two cascade Marx generator with low inductance pulse transformer. Application this pulse generator to excitation of super-atmospheric pressure CO<sub>2</sub> laser demonstrated its reliability at the pulse repetition rates up to 5 kHz at total pressures of CO<sub>2</sub>:N<sub>2</sub>:He mixtures <tex>$1div 5 text{atm}$</tex>.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123594564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242155
N. Zubarev, A. Sadykova, S. Shunailov, A. Kozyrev, G. Mesyats, K. Sharypov, M. Ulmaskulov, N. Semeniuk, V. Shpak, M. Yalandin, O. Zubareva
Properties of the runaway electron flow (REF) generated in an air-filled high-voltage interelectrode gap with a drastically inhomogeneous electric field distribution are presented. We have shown that REF initiated near the tip of a conical cathode involves high-energy electron fraction with ultrashort length of about 10 ps. Analytical and numerical considerations show that the REF generation and cessation is determined by a combination of ionization processes in the gas in the vicinity of the cathode, resulting in multiplication of free electrons and expansion of the cathode plasma layer, and dynamic processes that switch on/off a threshold electric field at the anode side plasma border which is sufficiently high for electrons to become runaway. The characteristic time of REF generation and termination can be estimated from the rate of ionization at a near-threshold field as ~2 ps. This elementary time determines the pulse length for the runaway electron current that was calculated to be ~6 ps, which is close to its experimental value.
{"title":"Analysis of the Minimum Duration of the Runaway Electron Flow in an Air Electrode Gap","authors":"N. Zubarev, A. Sadykova, S. Shunailov, A. Kozyrev, G. Mesyats, K. Sharypov, M. Ulmaskulov, N. Semeniuk, V. Shpak, M. Yalandin, O. Zubareva","doi":"10.1109/EFRE47760.2020.9242155","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242155","url":null,"abstract":"Properties of the runaway electron flow (REF) generated in an air-filled high-voltage interelectrode gap with a drastically inhomogeneous electric field distribution are presented. We have shown that REF initiated near the tip of a conical cathode involves high-energy electron fraction with ultrashort length of about 10 ps. Analytical and numerical considerations show that the REF generation and cessation is determined by a combination of ionization processes in the gas in the vicinity of the cathode, resulting in multiplication of free electrons and expansion of the cathode plasma layer, and dynamic processes that switch on/off a threshold electric field at the anode side plasma border which is sufficiently high for electrons to become runaway. The characteristic time of REF generation and termination can be estimated from the rate of ionization at a near-threshold field as ~2 ps. This elementary time determines the pulse length for the runaway electron current that was calculated to be ~6 ps, which is close to its experimental value.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126609443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242156
S. Loginov
The paper analyzes the penetration of a magnetic field into the plasma bridge of nanosecond and microsecond opening switches. For switches with a conduction time of ~ 100 ns, simple formulae are derived to estimate the magnetic field velocity in collisionless and collisional plasmas. It is shown that in both cases this velocity is determined by the magnetic field rise rate to plasma density ratio raised to the 1/2 power. As the conduction time is increased to ~ 1 µs, the field velocity starts to depend on the plasma aggregation by a magnetic piston. At the same time, irrespective of the conduction time, the electron flow velocity is limited by the radial drift velocity in crossed magnetic and polarization electric fields. Such a limitation suppresses the current channel conductivity with respect to the Spitzer value by a factor equal to the electron magnetization parameter raised to one or another power. On completion of the conduction phase, the rate of rise of the switch resistance is proportional to the electron drift velocity. The peak switch voltage obtained in calculations is compared with its values recorded in experiments on mega-ampere current switching. A procedure is also presented for calculating the switch parameters to obtain the maximum possible voltage in the phase of current cutoff.
{"title":"Self-Magnetic Insulation in Plasma Opening Switches","authors":"S. Loginov","doi":"10.1109/EFRE47760.2020.9242156","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242156","url":null,"abstract":"The paper analyzes the penetration of a magnetic field into the plasma bridge of nanosecond and microsecond opening switches. For switches with a conduction time of ~ 100 ns, simple formulae are derived to estimate the magnetic field velocity in collisionless and collisional plasmas. It is shown that in both cases this velocity is determined by the magnetic field rise rate to plasma density ratio raised to the 1/2 power. As the conduction time is increased to ~ 1 µs, the field velocity starts to depend on the plasma aggregation by a magnetic piston. At the same time, irrespective of the conduction time, the electron flow velocity is limited by the radial drift velocity in crossed magnetic and polarization electric fields. Such a limitation suppresses the current channel conductivity with respect to the Spitzer value by a factor equal to the electron magnetization parameter raised to one or another power. On completion of the conduction phase, the rate of rise of the switch resistance is proportional to the electron drift velocity. The peak switch voltage obtained in calculations is compared with its values recorded in experiments on mega-ampere current switching. A procedure is also presented for calculating the switch parameters to obtain the maximum possible voltage in the phase of current cutoff.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126618316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241927
Y. Ivanov, I. Lopatin, Yulia I. Denisova, E. Petrikova, O. Tolkachev
The work is aimed at analyzing the structure and properties of high-chromium austenitic steel AISI 310S, subjected to nitriding in a low-pressure gas discharge plasma. Nitriding was carried out on the «ELION» setup at 723, 793, and 823 K temperatures and 1, 3, and 5 hours duration. For effective heating of the samples, the electronic component of the gas discharge plasma was used. This treatment mode is called the elion mode, that is, it includes the action of both the electronic and ion components of a non-self-sustained arc discharge plasma with a glowing cathode. It was established that the hardness of the surface layer of steel is maximum (10.8 GPa) at a nitriding temperature of 793 K, regardless of the process duration. The thickness of the hardened layer reaches $60 mumathrm{m}$ and weakly depends on the process temperature. It is shown that the minimum (≈200 times less than the wear parameter of the initial steel) value of the wear parameter (maximum wear resistance) is achieved after 3 hours of nitriding at temperature of 793 K. It was found that nitrogen saturation of AISI 310S austenitic high-chromium steel in a low-pressure gas discharge plasma is accompanied by the formation of a multiphase structure. The hardening phases of the layer are chromium and iron nitrides, the particle sizes vary within a few tens of nanometers. It was shown for the first time that with the elion nitriding method for AISI 310S steel, a plate-like structure with alternating plates of austenite and iron nitride of the composition Fe4N is formed in the modified layer; the austenite plates transverse dimensions vary in the range of 10–60 nm, nitride layers transverse sizes vary in the range of 10–23 nm.
{"title":"Elion Method of Nitriding of High-Chromium Stainless Steel: Structure and Properties","authors":"Y. Ivanov, I. Lopatin, Yulia I. Denisova, E. Petrikova, O. Tolkachev","doi":"10.1109/EFRE47760.2020.9241927","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241927","url":null,"abstract":"The work is aimed at analyzing the structure and properties of high-chromium austenitic steel AISI 310S, subjected to nitriding in a low-pressure gas discharge plasma. Nitriding was carried out on the «ELION» setup at 723, 793, and 823 K temperatures and 1, 3, and 5 hours duration. For effective heating of the samples, the electronic component of the gas discharge plasma was used. This treatment mode is called the elion mode, that is, it includes the action of both the electronic and ion components of a non-self-sustained arc discharge plasma with a glowing cathode. It was established that the hardness of the surface layer of steel is maximum (10.8 GPa) at a nitriding temperature of 793 K, regardless of the process duration. The thickness of the hardened layer reaches $60 mumathrm{m}$ and weakly depends on the process temperature. It is shown that the minimum (≈200 times less than the wear parameter of the initial steel) value of the wear parameter (maximum wear resistance) is achieved after 3 hours of nitriding at temperature of 793 K. It was found that nitrogen saturation of AISI 310S austenitic high-chromium steel in a low-pressure gas discharge plasma is accompanied by the formation of a multiphase structure. The hardening phases of the layer are chromium and iron nitrides, the particle sizes vary within a few tens of nanometers. It was shown for the first time that with the elion nitriding method for AISI 310S steel, a plate-like structure with alternating plates of austenite and iron nitride of the composition Fe4N is formed in the modified layer; the austenite plates transverse dimensions vary in the range of 10–60 nm, nitride layers transverse sizes vary in the range of 10–23 nm.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116400958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242104
A. Klopotov, Yu.A. Kakushkin, A. Potekaev, O. Volokitin, S. Kislitsyn, V. Kulagina
The paper presents the results of studies of the effect of alpha-particle irradiation on the structural-phase composition of nitride coatings CrTiN, MoTiN and NbTiN on the surface of a steel substrate. The coatings were formed by vacuum-arc condensation in a gas medium with N2 using ion bombardment with the use of Ti, Cr, and Mo cathodes. In addition, coatings in a N2 gas medium on a steel substrate were produced by magnetron sputtering from Ti and Nb metals. Experimental data and the analysis of state diagrams of ternary systems of nitrides based on titanium and vanadium with transition metals of IVA-VIA groups have allowed deriving criteria for choosing materials for production of nitride coatings with a fairly high radiation stability.
{"title":"Effect Of Irradiation With Low-Energy Alpha Particles On The Structural-Phase State Of Coatings Of Triple Nitride Systems Based On Titanium And Vanadium On Steel","authors":"A. Klopotov, Yu.A. Kakushkin, A. Potekaev, O. Volokitin, S. Kislitsyn, V. Kulagina","doi":"10.1109/EFRE47760.2020.9242104","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242104","url":null,"abstract":"The paper presents the results of studies of the effect of alpha-particle irradiation on the structural-phase composition of nitride coatings CrTiN, MoTiN and NbTiN on the surface of a steel substrate. The coatings were formed by vacuum-arc condensation in a gas medium with N2 using ion bombardment with the use of Ti, Cr, and Mo cathodes. In addition, coatings in a N2 gas medium on a steel substrate were produced by magnetron sputtering from Ti and Nb metals. Experimental data and the analysis of state diagrams of ternary systems of nitrides based on titanium and vanadium with transition metals of IVA-VIA groups have allowed deriving criteria for choosing materials for production of nitride coatings with a fairly high radiation stability.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116537115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241978
A. Nikolaev, E. Oks, V. Frolova, A. Vodopyanov, D. Mansfeld, G. Yushkov
Supersonic plasma flows are used for surface modification of steels and alloys, simulation of plasma effects on the walls of fusion facilities, and laboratory research in astrophysical phenomena such as coronal loops on the Sun or planetary magnetospheres. The paper presents a high-current vacuum arc source which produces supersonic dense plasma flows of metal ions whose estimated velocities lie in the range of Mach numbers $mathrm{M}=3-6$. The source is designed to study the interaction of dense pulsed plasma flows with strong magnetic fields of a few Tesla at electron cyclotron resonance. The source with its power supply allows one to widely vary the plasma density (1013–1015part/cm3), the arc current, and its pulse duration and to form arc current pulses of different shapes. In the experiments reported, we used two different shapes of arc current pulses: a quasi-rectangular pulse with an arc current of 0.2-3.5 kA and duration of $700 mumathrm{s}$ and a sine-wave pulse with an arc current of 1–25 kA and duration of about $120 mumathrm{s}$. The pulse repetition rate was up to 0.1 Hz. The pulsed energy of the source was up to 2.5 kJ. In the paper, we consider the design features and parameters of the plasma source, the results of measurements of the plasma flow parameters, and the effect of a strong magnetic field with different LC line configurations.
超音速等离子体流被用于钢和合金的表面改性，模拟等离子体对聚变设施壁面的影响，以及天体物理现象的实验室研究，如太阳或行星磁层上的日冕环。本文介绍了一种大电流真空电弧源，它能产生估计速度在马赫数$ mathm {M}=3-6$范围内的金属离子的超音速致密等离子体流。该源用于研究密集脉冲等离子体流与几特斯拉强磁场在电子回旋共振下的相互作用。该源及其电源允许人们广泛改变等离子体密度(1013-1015part /cm3)、电弧电流及其脉冲持续时间，并形成不同形状的电弧电流脉冲。在实验报告中，我们使用了两种不同形状的电弧电流脉冲:电弧电流为0.2-3.5 kA，持续时间为700 mu mathm {s}$的准矩形脉冲和电弧电流为1-25 kA，持续时间约为120 mu mathm {s}$的正弦波脉冲。脉冲重复频率高达0.1 Hz。该光源的脉冲能量高达2.5 kJ。在本文中，我们考虑了等离子体源的设计特点和参数，等离子体流动参数的测量结果，以及不同LC线配置下强磁场的影响。
{"title":"High-Current Vacuum-Arc Plasma Source for Producing Supersonic Plasma Flows in Magnetic Fields","authors":"A. Nikolaev, E. Oks, V. Frolova, A. Vodopyanov, D. Mansfeld, G. Yushkov","doi":"10.1109/EFRE47760.2020.9241978","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241978","url":null,"abstract":"Supersonic plasma flows are used for surface modification of steels and alloys, simulation of plasma effects on the walls of fusion facilities, and laboratory research in astrophysical phenomena such as coronal loops on the Sun or planetary magnetospheres. The paper presents a high-current vacuum arc source which produces supersonic dense plasma flows of metal ions whose estimated velocities lie in the range of Mach numbers $mathrm{M}=3-6$. The source is designed to study the interaction of dense pulsed plasma flows with strong magnetic fields of a few Tesla at electron cyclotron resonance. The source with its power supply allows one to widely vary the plasma density (1013–1015part/cm3), the arc current, and its pulse duration and to form arc current pulses of different shapes. In the experiments reported, we used two different shapes of arc current pulses: a quasi-rectangular pulse with an arc current of 0.2-3.5 kA and duration of $700 mumathrm{s}$ and a sine-wave pulse with an arc current of 1–25 kA and duration of about $120 mumathrm{s}$. The pulse repetition rate was up to 0.1 Hz. The pulsed energy of the source was up to 2.5 kJ. In the paper, we consider the design features and parameters of the plasma source, the results of measurements of the plasma flow parameters, and the effect of a strong magnetic field with different LC line configurations.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122905809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241908
A. Zhubaev, Gulzat Zh. Omarpatsha, Amangul Sh. Amantayeva, Diana M. Bakhtiyarova
The layered system $text{Zr}(2 mu mathrm{m})-text{Fe}(5 mu mathrm{m})$ after magnetron sputtering of Zirconium coating and isothermal annealing at 900°C have been studied by means of Mässbauer spectroscopy on 57Fe nuclei and XRD. The sequence of phase transformations is established. The relative content of phases formed in the sample volume at each of the annealing stages was obtained. The possibility of obtaining thermal stabilization of the intermetallic phase of Fe3Zr on an armco-Iron substrate is shown.
利用Mässbauer光谱和XRD研究了锆涂层磁控溅射和900℃等温退火后的层状体系$text{Zr}(2 mu mathm {m})- $ text{Fe}(5 mu mathm {m})$。建立了相变的顺序。得到了各退火阶段试样体积中形成相的相对含量。表明了在臂铁衬底上获得Fe3Zr金属间相热稳定的可能性。
{"title":"Thermal Stabilization of the Layered System $text{Fe}_{3}text{Zr}-alpha-text{Fe}$","authors":"A. Zhubaev, Gulzat Zh. Omarpatsha, Amangul Sh. Amantayeva, Diana M. Bakhtiyarova","doi":"10.1109/EFRE47760.2020.9241908","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241908","url":null,"abstract":"The layered system $text{Zr}(2 mu mathrm{m})-text{Fe}(5 mu mathrm{m})$ after magnetron sputtering of Zirconium coating and isothermal annealing at 900°C have been studied by means of Mässbauer spectroscopy on 57Fe nuclei and XRD. The sequence of phase transformations is established. The relative content of phases formed in the sample volume at each of the annealing stages was obtained. The possibility of obtaining thermal stabilization of the intermetallic phase of Fe3Zr on an armco-Iron substrate is shown.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122119280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241935
R. Cherdizov, V. Kokshenev, A. Shishlov, R. Baksht, Vladimir I. Oreshkin, A. Rousskikh, A. Zhigalin
Experiments on imploding metal-puff Z pinches with an outer plasma shell were performed at currents of 2–3 MA on the GIT-12 generator (4.7 MA, $1.7 mu mathrm{s}$) at the Institute of High Current Electronics (Tomsk). The outer plasma shell was produced by 48 plasma guns arranged in a circle of diameter 35 cm. The pinch plasma was generated by a vacuum arc which operated in a gap between an aluminum cathode and an aluminum anode. The initial mass density profiles of metal-puff pinches generated in different load configurations were estimated from experimentally obtained current and voltage waveforms, signals of magnetic probes, and images taken with a streak camera and an HSFC Pro four-frame optical camera. For radii $R$ larger than 0.2 cm, the initial radial mass density profile of a metal-puff pinch was approximated by three Gauss functions. The central part of the pinch with R < 0.2 cm was formed by an aluminum plasma jet with a uniform density. The density profiles in the adjacent jet region (0.2 < R < 2 cm) were provided by the contribution of the aluminum ions from the vacuum arc anode. The next density profile (2 < R < 14 cm) was probably determined by the mass contribution from the surface of the insulator near which the vacuum arc operated. The density peak at the periphery (14 < R < 16 cm) occurred due to the operation of the plasma guns at the diameter of 35 cm.
在托木斯克大电流电子学研究所的GIT-12发生器(4.7 MA， $1.7 mu mathm {s}$)上，以2-3 MA的电流进行了外等离子体壳内爆金属膨胀Z钳的实验。外层等离子体外壳由48支等离子体枪组成，排列成直径35厘米的圆形。掐尖等离子体是由真空电弧在铝阴极和铝阳极之间的间隙中产生的。根据实验获得的电流和电压波形、磁探头信号以及条纹相机和HSFC Pro四帧光学相机拍摄的图像，估计了不同负载配置下产生的金属泡芙缩紧的初始质量密度分布。当半径R大于0.2 cm时，金属抽吸的初始径向质量密度分布近似为三个高斯函数。用密度均匀的铝等离子体射流形成R < 0.2 cm的掐痕中心部分。邻近喷射区(0.2 < R < 2 cm)的密度分布由真空电弧阳极铝离子的贡献提供。下一个密度分布(2 < R < 14 cm)可能是由真空电弧运行附近绝缘子表面的质量贡献决定的。等离子体枪在直径为35 cm处运行，在外围(14 < R < 16 cm)处出现密度峰值。
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