%0 Journal Article
%A Nagel, O.
%A Fritton, M.
%A Mutschke, A.
%A Spörlein, M.
%A Stark, A.
%A Sheptyakov, D.
%A Höschen, C.
%A Felfer, P.
%A Gilles, R.
%A Neumeier, S.
%T Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy
%J Scripta materialia
%V 260
%@ 1359-6462
%C Amsterdam [u.a.]
%I Elsevier Science
%M IMPULSE-2025-00069
%P 116594 -
%D 2025
%X Due to the increasing significance of hydrogen in future applications, it is crucial to address the potential effects of hydrogen on material safety in hydrogen-rich environments. Detecting hydrogen remains challenging. In this study, we provide an explanation for hydrogen embrittlement in a CoNiCr-based superalloy using a combination of NanoSIMS measurements, synchrotron and neutron diffraction, and analysis of fractured tensile samples from hydrogen-charged specimens. NanoSIMS mappings and diffraction experiments revealed the highest hydrogen concentration inside precipitates of the µ phase. Neutron diffraction experiments indicate that the γ′ phase slightly incorporates more hydrogen than the γ phase, therefore expands comparatively more and thus, the positive γ/γ′-lattice misfit increases a little. This results in a strong influence of hydrogen on the mechanical properties of hydrogen as revealed by tensile tests. Hydrogen inside µ phase particles and at γ/γ′-interfaces leads to pronounced crack initiation at γ/µ-interfaces and facilitates crack propagation along weakened γ/γ′-interfaces.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1016/j.scriptamat.2025.116594
%U https://impulse.mlz-garching.de/record/334743