Journal Article

PUBDB-2025-00407

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of hydrogen on the γ-matrix lattice parameters of a Ni-based superalloy – A synchrotron diffraction study

Fritton, M. (Corresponding author)Extern* ; Mutschke, A.Extern* ; Nagel, O.Extern* ; Stark, A.Extern*Hereon* ; Hafez-Haghighat, M. ; Gehrmann, B.Extern* ; Neumeier, S.Extern* ; Gilles, R.Extern*

2025
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2025.178693  doi:10.3204/PUBDB-2025-00407

Abstract: Hydrogen, as an energy carrier, is expected to play a significant role in future mobility. The objective of this study was to investigate the hydrogen uptake of the Ni-based superalloy VDM® Alloy 780 through electrochemical charging, using high-energy synchrotron X-ray diffraction (HEXRD). It is shown that the incorporation of hydrogen at interstitial positions in the crystal lattice leads to a slight increase in the lattice parameters compared to hydrogen-free analogs. In-situ HEXRD measurements showed a convergence of the lattice parameters at elevated temperatures, indicating the reversibility of hydrogenation through diffusion and subsequent effusion of hydrogen. Hot gas extraction (HGE) measurements were conducted to quantify hydrogen and complement the diffraction data, showing that prolonged electrochemical charging leads to increased hydrogen content. Hydrogen quantification at different temperatures confirmed increasing diffusion with temperature, i.e. higher measured hydrogen values at elevated temperatures. Additionally, tensile tests were conducted to evaluate the influence of hydrogen on the alloy during deformation. Fractographic analysis via SEM showed that, for the hydrogen-treated specimen, cleavage fracture occurred in the vicinity of the surface, whereas the reference sample displayed typical ductile fracture patterns over the entire fracture surface.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)
2. Technische Universität München (TUM)
3. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. 05K22WO3 - Verbundprojekt 05K2022 - H2Mat: Ein Gerät zur Untersuchung des Einflusses der Wasserstoffbe- und -entladung für industriell entwickelte und verwendete Legierungen. Teilprojekt 1. (BMBF-05K22WO3) (BMBF-05K22WO3)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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