2022/09/20 by Örnek, Cem, Larsson, Alfred, Mansoor, Mubashir +10
#Computational Physics (physics.comp-ph) #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Materials Science (cond-mat.mtrl-sci)
paper · doi:10.48550/arxiv.2209.09516
Various mechanisms have been proposed for hydrogen embrittlement, but the causation of hydrogen-induced material degradation has remained unclear. This work shows hydrogen embrittlement due to phase instability (decomposition). In-situ diffraction measurements revealed metastable hydrides formed in stainless steel, typically declared as a non-hydride forming material. Hydride formation is possible by increasing the hydrogen chemical potential during electrochemical charging and low defect formation energy of hydrogen interstitials. Our findings demonstrate that hydrogen-induced material degradation can only be understood if measured in situ and in real-time during the embrittlement process.