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MM: Fachverband Metall- und Materialphysik

MM 35: Topical Session: Hydrogen in Materials: from Storage to Embrittlement VI

MM 35.4: Talk

Wednesday, March 20, 2024, 12:45–13:00, C 130

Probing hydrogen with high spatial resolution: a new correlative deformation/hydrogen sensing technique for hydrogen embrittlement study — •Maria Vrellou¹, Xufei Fang¹, Hans-Christian Schneider¹, Alexander Welle², Astrid Pundt¹, and Christoph Kirchlechner¹ — ¹Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany

Hydrogen is one of the most promising alternatives to fossil fuels. The green hydrogen produced using energy from processes with low gas emissions or from renewable sources is considered as a potential game changer. However, hydrogen embrittlement (HE) is a major concern in hydrogen storage and transportation, and the underlying mechanisms need to be better addressed. Here, we present a novel approach aiming to isolate, observe and quantify the debated mechanisms responsible for HE. Our project, TRITIum based microMEchanics (TRITIME), aims to use techniques capable of achieving hydrogen imaging at quasi-atomistic resolution. APT and ToF-SIMS will be used to study the local and global tritium content in different microstructures in Ti and Zr samples that are susceptible to hydride formation, which is expected to provide better localization of the "hydrogen reservoir" facilitating hydrogen detection and quantification when employing the high-spatial-resolution techniques. To decipher the contribution of each one of the HE mechanisms, mechanical testing such as micro-pillar compression will be applied and studied.

Keywords: Hydrogen Embrittlement; Micro-mechanics; APT; ToF-SIMS; Tritium