journal article·2025-05-19Open access

Hydrogen diffusivity, solubility, and embrittlement of high-strength copper alloys in comparison to stainless steel

David Kniep, Mario Rudolphi, Klaus Ohla, Andreas Frehn, Mathias Christian Galetz

npj Materials Degradation· Volume 9· Issue 1

Abstract

Abstract The usage of high-strength materials in hydrogen-containing atmospheres is a particular challenge. High-strength copper alloys, which have not been extensively studied, may offer significant potential. In this study, the hydrogen solubility, diffusivity, and embrittlement of two high-strength copper-based alloys, Alloy 25 HT and PerforMet AT, are investigated compared to austenitic stainless steel 316 L. Across all charging conditions, the steel 316 L absorbed multiple orders of magnitude more hydrogen than the copper alloys. Permeation tests reveal effective diffusion coefficients of 1.7 × 10− 13 m²/s for Alloy 25 HT and 3.0 × 10−14 m²/s for PerforMet AT at 60 °C, respectively. Results of charged tensile specimens in slow strain rate tests indicated a negligible reduction of strain for Alloy 25 HT and a minor reduction to 83.5% of the strain of the uncharged PerforMet AT, suggesting a low susceptibility to hydrogen embrittlement under these tested conditions.
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Research context

OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Corrosion Behavior and Inhibition · Microstructure and Mechanical Properties of Steels

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