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MM: Fachverband Metall- und Materialphysik
MM 33: Topical Session: Interface-dominated phenomena - Hydrogen at Interfaces
MM 33.5: Vortrag
Mittwoch, 18. März 2020, 11:15–11:30, IFW A
ETEM studies on hydride precipitation and growth in Mg films — Magnus Hamm1, Marian David Bongers1, Vladimir Roddatis1, Stefan Dietrich2, Karl-Heinz Lang2, and •Astrid Pundt2 — 1Göttingen University, Institute of Materials Physics (IMP), Göttingen, Germany — 2Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Understanding solute-induced phase transformations is crucial in a variety of research fields such as catalysis, memory switching or energy storage. We present solute-induced phase transformations studied on the model system magnesium-hydrogen (MgH) which provides high lattice expansion during the phase transformation. In situ precipitation and growth of MgH2 is studied in an environmental transmission electron microscope (ETEM), combining electron energy loss spectroscopy (EELS) and various imaging techniques. We observe that the Mg-hydride (MgH2) formation proceeds through the formation of nanocrystals that are separated by low-angle grain boundaries. We attribute this microstructural change to large strains and stresses between the matrix and the MgH2 created during the transformation. [1] M. Hamm et al., Int. J. Hydr. Energy 44 (2019) 32112.