Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 15: Hydrogen in Materials: Hydrogen Effects
MM 15.3: Talk
Tuesday, September 6, 2022, 12:15–12:30, H46
Impact of H on Fe and Cr diffusion in pure Fe and FeCr alloy — •Olga Lukianova1, Anton Chyrkin2, Vladislav Kulitckii1, Jan Froitzheim2, Sergei Starikov3, Gerhard Wilde1, Ralf Drautz3, and Sergiy Divinski1 — 1Institute of Materials Physics, University of Münster, Münster, Germany — 2Chalmers University of Technology, Department of Chemistry and Chemical Engineering, Division of Energy and Materials, Gothenburg, Sweden — 3ICAMS, Ruhr-Universität Bochum, Bochum, Germany
The impact of hydrogen on the tracer diffusion of the Fe and Cr in pure iron and Fe-18wt.%Cr alloy was measured at 873 K. The annealing treatments were performed in purified argon (H-free) and Ar+H2 atmospheres. Volume diffusion of Cr was found not to be affected by the presence of H in both alpha-Fe and the FeCr alloy whereas volume diffusion of Fe was enhanced by an order of magnitude. On the contrary, grain boundary diffusion of Cr in the FeCr alloy was retarded, while it was not affected by hydrogen in pure iron. Grain boundary diffusion of Fe remains practically unchanged in both materials. The tracer data are compared with the predictions from atomistic simulations.