Damaging of tungsten and tungsten–tantalum alloy exposed in ITER ELM-like conditions

Makhlai, V.А.; Garkusha, I.E.; Linke, J.; Malykhin, S.V.; Aksenov, N.N.; Byrka, O.V.; Herashchenko, S.S.; Surovitskiy, S.V.; Wirtz, M.

doi:10.1016/j.nme.2016.04.001

Cited by 20 publications

(9 citation statements)

References 11 publications

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“…Residual and formed during operation mechanical stresses on the surface of structural elements of highenergy systems significantly affect their service properties and, ultimately, the resource. It is known that the initial residual stresses have a strong influence on surface cracking, and unstressed surfaces are more resistant to cracking [3,4]. Numerous simulation experiments have shown that the initial stress state of the surface of tungsten-based materials can vary greatly under thermal and radiation loads [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Comparative XRD Analysis of the Stress State of a Thin Tungsten Ribbon and Magnetron-Sputtered Tungsten Coatings

Danilchenko¹,

Kochenko²,

Калинкевич³

et al. 2022

J. Nano- Electron. Phys.

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The stress state of a thin tungsten ribbon and magnetron-sputtered tungsten coatings on a ferrite steel substrate were investigated by X-ray tensometry (sin 2 ψ method). In-plane biaxial compressive stresses were revealed in the samples of the tungsten ribbon: y  −0.40 GPa and − 0.45 GPa in the rolling direction and x  − 0.28 GPa and − 0.25 GPa in the direction perpendicular to the rolling direction from the front and back sides, respectively. The magnetron-sputtered tungsten coatings have in-plane equiaxial stresses, rotationally symmetric with respect to the surface normal (x  y  ). The stress magnitudes in the tungsten coatings are several times higher than those in the tungsten ribbon. The highest compressive stress (-3.7 GPa) was found in a tungsten coating with a nominal thickness of 250 nm, in a coating with a thickness of 460 nm, the stress level was 1.5 times lower. The peculiarity of the analysis was that in the case of the tungsten ribbon, the line (310) was used, which certainly belongs to the precision region of the diffraction angles, while in the case of the tungsten coatings, due to the overlap of (310) α-W and ( 220) α-Fe lines, the lines ( 220) and ( 211) were used, which satisfy this condition to a lesser extent. The use of relatively soft Co-radiation (compared to Cu-radiation) somewhat mitigated this discrepancy. The stress-free lattice parameter (a0), corresponding to the undeformed cross section of the strain ellipsoid, was lower in the tungsten ribbon and higher in the coatings than the reference value for -W; as the coating thickness increases, this difference increases. The reasons for these differences are discussed. Considering the broadening of the tungsten diffraction peaks, it was found that both the small size of the crystallites and the microstrain of the crystal lattice are the cause of this broadening in the samples of both groups, although the microstructure of the coatings is much more defective.

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Section: Introductionmentioning

confidence: 99%

“…It is known that the initial residual stresses have a strong influence on surface cracking, and unstressed surfaces are more resistant to cracking [3,4]. Numerous simulation experiments have shown that the initial stress state of the surface of tungsten-based materials can vary greatly under thermal and radiation loads [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Comparative XRD Analysis of the Stress State of a Thin Tungsten Ribbon and Magnetron-Sputtered Tungsten Coatings

Danilchenko¹,

Kochenko²,

Калинкевич³

et al. 2022

J. Nano- Electron. Phys.

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“…Second, in the process of jet formation, W and Ta, which exist alone, must be fully mixed to prevent W from breaking. Due to the brittle phase formed by solid solution between W and Ta [13,14], TiN coating with micro thickness was selected as the interlayer to prevent the direct contacting of W and Ta and further enhancing the interface bonding strength.…”

Section: Introductionmentioning

confidence: 99%

Study on W/(TiN)Ta composite and its application in shape charge liner

Yan

Suo

2020

SN Appl. Sci.

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In the present work, W/Ta and W/TiN/Ta laminated composites have been prepared by spark plasma sintering (SPS) and compared with W/W multilayer through three point bending and tensile tests. The results show that Ta has good reinforcing and toughening effect on W. The tensile strength of W/Ta is 371 MPa, and the three-point bending strength is 774 MPa, which are much higher than that of W/W. To further improve the mechanical property pf W/Ta, W-Ta laminated composites with TiN interlayer (W/TiN/Ta) has been studied. W/TiN/Ta have much higher strength than that of W/Ta due to intrinsic high strength of TiN and the increased layered interfaces, while worse ductility. Then, the feasibility of applying W/Ta laminated composite to the liner was tested by explosion overload test. The test results have been analyzed by Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD). Explosion overload test results reveal that W/Ta laminated composite has the potential to be applied in shaped charge liner.

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“…Tungsten and tantalum are considered [1][2][3][4][5] as the protective plasma-facing materials for components of thermonuclear reactors with magnetic [1,[3][4][5] and inertial plasma confinement [2]. They are proposed to be used both as separate materials (W [1,3,5] and Ta [2,3]) and in form of tungsten-tantalum composites [4] (with 10 and 20 at.% Ta fibers in W matrix) and WTa 5 alloys [5] (with 5 wt.% Ta). One of the ways of production of protective coatings for plasma-facing components (PFC) is the plasma sputtering of tungsten or tantalum onto surfaces of PFC [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…One of the advantages of Ta and W is the negligible accumulation of hydrogen isotopes in them, i.e., the insignificant accumulation of radioactive tritium under plasma irradiation. This problem is intensively studied by the authors of [1][2][3][4][5][6][7][8][9][10][11]. The main aims of such investigations are increasing the radiation resistance of the proposed materials and obtaining new materials with improved parameters.…”

Section: Introductionmentioning

confidence: 99%

DEPENDENCES OF HELIUM RETENTION IN TUNGSTEN AND TANTALUM COATINGS IRRADIATED WITH He+ IONS ON FLUENCE AND TEMPERATURE

Bobkov¹,

Tishchenko²,

Kovtunenko³

et al. 2020

Problems of Atomic Science and Technology

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The processes of helium accumulation and thermal desorption for tungsten and tantalum coatings deposited on a stainless-steel substrate with an intermediate titanium layer were studied at various temperatures of the samples when irradiated with He+ ions to various fluences. The dependences of the concentration of captured helium and the form of the spectra of its thermal desorption into vacuum were found both on the fluence of He+ ions and on the temperature of the samples upon irradiation. Possible mechanisms for the accumulation and thermal desorption of helium, as well as the formation of defects in the crystal lattice of the samples, are discussed.

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Damaging of tungsten and tungsten–tantalum alloy exposed in ITER ELM-like conditions

Cited by 20 publications

References 11 publications

Comparative XRD Analysis of the Stress State of a Thin Tungsten Ribbon and Magnetron-Sputtered Tungsten Coatings

Comparative XRD Analysis of the Stress State of a Thin Tungsten Ribbon and Magnetron-Sputtered Tungsten Coatings

Study on W/(TiN)Ta composite and its application in shape charge liner

DEPENDENCES OF HELIUM RETENTION IN TUNGSTEN AND TANTALUM COATINGS IRRADIATED WITH He+ IONS ON FLUENCE AND TEMPERATURE

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