SKM 2023 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 12: Poster I
MM 12.7: Poster
Monday, March 27, 2023, 18:15–20:00, P2/OG1+2
Hydrogen Diffusion in High-Pressure Torsion (HPT) deformed Magnesium and Magnesium-alloys — •Giorgia Guardi1, Sabine Schlabach1,2,3, Julia Ivanisenko2,3, Stefan Wagner1, and Astrid Pundt1 — 1Karlsruhe Institute of Technology, Institute for Applied Materials, Karlsruhe, Germany — 2Karlsruhe Institute of Technology, Institute of Nanotechnology, Karlsruhe, Germany — 3Karlsruhe Institute of Technology, Karlsruhe Nano Micro Facility, Karlsruhe, Germany
Magnesium is considered a promising material for solid-state Hydrogen storage due to the high achievable gravimetric density of 7.6 wt.% upon Magnesium Hydride (MgH2) formation. There are however limitations to its practical application, mainly due to the low diffusion rate of Hydrogen in the Magnesium hydride phase, which leads to slow absorption kinetics. A possible way to improve hydrogen kinetics in Magnesium hydride is by increasing the volume fraction of grain boundaries, which can act as fast-diffusion pathways; this can be achieved in bulk samples by severe plastic deformation. In this work we use High-Pressure Torsion (HPT) to increase the grain boundaries concentration in bulk Mg and Mg-Zn-Zr alloys (ZK30 and ZK60) and we investigate how this affects hydrogen diffusion. The diffusivity of hydrogen in Magnesium is evaluated by gas volumetry at room temperature.