Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.113: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Investigation of Grain Boundary Transport in Tungsten by Hydrogenography — •Fahrudin Delic1,2, Armin Manhard2, and Udo von Toussaint2 — 1Technical University of Munich, Munich, Germany — 2Max Planck Institute for Plasma Physics, Garching, Germany
The permeation of deuterium through grain boundaries in tungsten was studied on recrystallized foils using the hydrogenography method, employing tungsten trioxide as a hydrogen indicator. The temperature dependence of grain boundary transport was analyzed on 50 µm foils up to 700 K, revealing an overall increase in permeation activity with rising temperature. At around 630 K, a distinct halo structure forms around several grain boundaries, indicating the onset of deuterium desorption from the boundaries and the gradual transition toward bulk-dominated permeation. To investigate geometrical influences on permeation behavior, the 50 µm results were compared with measurements on 25 µm foils. In thinner foils, the grain geometry facilitates bulk transport, and a depletion region of hydrogen permeation around certain grain boundaries becomes visible. The hydrogenography analysis is furthermore complemented by grain orientation mapping via EBSD.
Keywords: Grain boundaries; Tungsten; Deuterium; Hydrogenography; Permeation