Home > Publications database > On the plasma suitability of WCrY smart alloys—the effect of mixed D+Ar/He plasmas > print

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024 7 _ |a 10.1088/1402-4896/ab367c
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037 _ _ |a FZJ-2021-01498
082 _ _ |a 530
100 1 _ |a Schmitz, Janina
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245 _ _ |a On the plasma suitability of WCrY smart alloys—the effect of mixed D+Ar/He plasmas
260 _ _ |a Stockholm
|c 2020
|b The Royal Swedish Academy of Sciences
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520 _ _ |a Tungsten-chromium-yttrium (WCrY) smart alloys are foreseen as first wall materials for future fusion devices such as DEMO. While suppressing W oxidation during accidental conditions, they should behave like pure W during plasma operation due to preferential sputtering of the lighter alloying elements Cr and Y causing W enrichment at the surface. This paper reports on the results of the simultaneous exposure of WCrY and pure W reference samples to mixed D + 1%Ar+5 %He plasma in the linear plasma device PSI-2. Further, a comparison with exposures to pure D and D + 1 %Ar plasma is made. At incident ion energies of 120 eV, exposure to pure D plasma results in a W-enriched alloy surface due to the preferential sputtering of Cr and Y, while the addition of Ar leads to enhanced erosion for W and WCrY and reduces the W enrichment in smart alloys. With the addition of He to the plasma, erosion of WCrY is enhanced compared to that of pure W. To investigate the plasma impact on the oxidation behaviour, plasma-exposed and reference samples were oxidised in controlled dry oxygen-containing atmosphere at $1000\,^\circ {\rm{C}}$. The sample geometry has a great impact on the oxidation behaviour. Yet, it can be shown that the good oxidation-suppressing properties of WCrY smart alloys are preserved during plasma exposure.
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700 1 _ |a Litnovsky, A.
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700 1 _ |a Klein, F.
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700 1 _ |a Lannoye, K De
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700 1 _ |a Kreter, A.
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700 1 _ |a Rasinski, M.
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700 1 _ |a Breuer, U.
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700 1 _ |a Gonzalez-Julian, J.
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700 1 _ |a Bram, M.
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700 1 _ |a Coenen, J. W.
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700 1 _ |a Linsmeier, Ch
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773 _ _ |a 10.1088/1402-4896/ab367c
|g Vol. T171, p. 014002 -
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856 4 _ |u https://juser.fz-juelich.de/record/891413/files/Schmitz_2020_Phys._Scr._2020_014002.pdf
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856 4 _ |y Published on 2020-02-27. Available in OpenAccess from 2021-02-27.
|u https://juser.fz-juelich.de/record/891413/files/Postprint_%20Janina%20Schmitz_on%20the%20plasma%20suitability.pdf
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