This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1016/j.jnucmat.2019.151767 in citations.
Preferential sputtering induced Cr-Diffusion during plasma exposure of WCrY smart alloys
Preferential sputtering induced Cr-Diffusion during plasma exposure of WCrY smart alloys
WCrY Smart Alloys are developed as first wall material of future fusion devices such as DEMO. They aim at behaving like pure W during plasma operation due to depletion of the alloying elements Cr and Y. The Cr concentration gradients induced by preferential plasma sputtering cause Cr-diffusion. The...
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Personal Name(s): | Schmitz, J. |
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Mutzke, A. / Litnovsky, A. (Corresponding author) / Klein, F. / Tan, Xiaoyue / Wegener, T. / Hansen, P. / Aghdassi, N. / Eksaeva, Alina / Rasinski, M. / Kreter, A. / Gonzalez-Julian, J. / Coenen, J. W. / Linsmeier, Ch. / Bram, M. | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 Plasmaphysik; IEK-4 |
Published in: | Journal of nuclear materials, 526 (2019) S. 151767 - |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2019
|
DOI: |
10.1016/j.jnucmat.2019.151767 |
Document Type: |
Journal Article |
Research Program: |
Methods and Concepts for Material Development |
Publikationsportal JuSER |
WCrY Smart Alloys are developed as first wall material of future fusion devices such as DEMO. They aim at behaving like pure W during plasma operation due to depletion of the alloying elements Cr and Y. The Cr concentration gradients induced by preferential plasma sputtering cause Cr-diffusion. The exposure of WCrY and W samples to pure D plasma, with a plasma ion energy of , is simulated using the dynamic version of SDTrimSP. Cr-diffusion is included into the model. Simulation results are compared with experimental results. At sample temperatures of more than 600∘C and sputtering by D plus residual oxygen in the plasma ion flux, the Cr-transport to the surface leads to enhanced erosion for WCrY samples. A diffusion coefficient for Cr in WCrY of the order of is determined. The suitability of WCrY as first wall armour and the influence of further effects, considering especially Cr-diffusion, is discussed. |