Generation of shock waves in materials science experiments with dense plasma focus device

Latyshev, S. V.; Грибков, В. А.; Maslyaev, S. A.; Пименов, В. Н.; Paduch, M.; Zielinska, E.

doi:10.1134/s2075113315020100

Cited by 16 publications

(4 citation statements)

References 3 publications

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“…Depending on the material, the values vary within 250-500 m. As it was shown theoretically by Latyshev et al [23], the shock wave can reach as deep as 500-800 m. Thus, it can be concluded that a decrease in conductivity is due to integral changes of materials state, which depend on irradiation conditions, development and a propagation of shock wave, but also on re-crystallisation processes of the material.…”

Section: Discussionmentioning

confidence: 76%

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The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

et al. 2016

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Abstract. The infl uence of extreme heat loads, as produced by a multiple pulses of non-homogeneous fl ow of slow plasma (0.1-1 keV) and fast ions (100 keV), on double-forged tungsten (DFW) was investigated. For generation of deuterium plasma and fast deuterons, plasma-focus devices PF-12 and PF-1000 are used. Depending on devices and conditions, the power fl ux density of plasma varied in a range of 10 7 -10 10 W/cm 2 with pulse duration of 50-100 ns. Power fl ux density of fast ions was 10 10 -10 12 W/cm 2 at the pulse duration of 10-50 ns. To achieve the combined effect of different kind of plasmas, the samples were later irradiated with hydrogen plasma (10 5 W/cm 2 , 0.25 ms) by a QSPA Kh-50 plasma generator. Surface modifi cation was analysed by scanning electron microscopy (SEM) and microroughness measurements. For estimation of damages in the bulk of material, an electrical conductivity method was used. Investigations showed that irradiation of DFW with multiple plasma pulses generated a mesh of micro-and macrocracks due to high heat load. A comparison with single forged tungsten (W) and tungsten doped with 1% lanthanum-oxide (WL10) reveals the better crack-resistance of DFW. Also, sizes of cells formed between the cracks on the DFW's surface were larger than in cases of W or WL10. Measurements of electrical conductivity indicated a layer of decreased conductivity, which reached up to 500 m. It depended mainly on values of power fl ux density of fast ions, but not on the number of pulses. Thus, it may be concluded that bulk defects (weakening bonds between grains and crystals, dislocations, point-defects) were generated due to mechanical shock wave, which was generated by the fast ions fl ux. Damages and erosion of materials under different combined radiation conditions have also been discussed.

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Section: Discussionmentioning

confidence: 76%

“…A. Baikov Institute of Metallurgy and Material Sciences. It can go as deep as 500-800 m inside the bulk, depending on the initial power fl ux density of fast ions on the samples' surface [23].…”

Section: Results and Analysis Of Bulk Effectsmentioning

confidence: 99%

The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

et al. 2016

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“…Two possible mechanisms of the pressure origin can be considered. The first is pressure induced in the material by the shock wave travelling in front of the plasma stream generated in PF6 [31,32]. It was reported that the pressures generated in an iron target can reach up to 20 GPa [32].…”

Section: Degradation Mechanism Of W-1%y 2 Omentioning

confidence: 99%

“…The first is pressure induced in the material by the shock wave travelling in front of the plasma stream generated in PF6 [31,32]. It was reported that the pressures generated in an iron target can reach up to 20 GPa [32]. However, the following conditions must be met, i.e.…”

Section: Degradation Mechanism Of W-1%y 2 Omentioning

confidence: 99%

Evaluation of surface, microstructure and phase modifications on various tungsten grades induced by pulsed plasma loading

et al. 2016

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Progress in the field of nuclear fusion requires the development of a new generation of tungsten materials that are expected to meet specific property, lifetime and safety requirements. Pursuing this goal, the new materials must be properly tested in a wide range of conditions including cases where material is brought to the molten stage, such as with large fusion plasma instabilities. In this study, two prospective candidates from the family of dispersion strengthened (DS) tungsten materials, i.e., W-1%Y2O3 and W-2.5%TiC, were subjected to extreme heat loading exerted by the deuterium plasma generator PF6. The study focuses on the interaction of the tungsten matrix with the dispersed particles during material melting. The materials underwent significant changes in microstructure and phase content. Among the most serious was the loss of TiC particles and void formation in W-2.5%TiC and phase change of polymorphic Y2O3 particles in W-1% Y2O3.

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Impact of pulsed deuterium plasma irradiation on dual-phase tungsten alloys

Tõkke

Laas

Priimets

et al. 2021

Fusion Engineering and Design

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Generation of shock waves in materials science experiments with dense plasma focus device

Cited by 16 publications

References 3 publications

The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

Evaluation of surface, microstructure and phase modifications on various tungsten grades induced by pulsed plasma loading

Impact of pulsed deuterium plasma irradiation on dual-phase tungsten alloys

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