SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Topical Session: Fundamentals of Fracture – Atomistic Studies of Fracture
MM 15.9: Vortrag
Dienstag, 28. März 2023, 12:45–13:00, SCH A 216
Tailoring negative pressure by crystal defects: Crack induced hydride formation in Al alloys — •Ali Tehranchi1, Poulami Charaborty1, Marti Lopez Freixes1, Eunan McEniry1, Baptiste Gault1,2, Tilmann Hickel1,3, and Jörg Neugebauer1 — 1Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany — 2Department of Materials, Imperial College, South Kensington,London, SW7 2AZ, UK — 3Bundesanstalt für Materialforschung und -prüfung (BAM)
Climate change motivates the search for non-carbon-emitting energy generation and storage solutions. Metal hydrides show promising characteristics for this purpose. To enhance the formation and stability of such often highly volatile hydrides we have consider a novel concept: tailoring and employing the negative pressure of microstructural and structural defects to enhance H solubility and thus hydride formation. Using systematic ab initio and atomistic simulations, we demonstrate that an enhancement in the formation of hydrides at the negatively pressurized crack tip region is feasible by increasing the mechanical tensile load on the specimen. The theoretical predictions have been used to reassess and interpret atom probe tomography experiments for a high-strength 7XXX-aluminium alloy that show a substantial enhancement of hydrogen concentration at structural defects near a stress-corrosion crack tip. Based on these insights we derive strategies for enhancing the capability of metals as H-storage materials.