Mechanism and prediction of hydrogen embrittlement in fcc stainless steels and high entropy alloys
Creators
- 1. Laboratory for Multiscale Mechanics Modeling (LAMMM) and National Centre for Computational Design and Discovery of Novel Materials (NCCR MARVEL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
- 2. Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düssseldorf, Germany
* Contact person
Description
The urgent need for clean energy coupled with the exceptional promise of hydrogen (H) as a clean fuel is driving development of new metals resistant to hydrogen embrittlement. Experiments on new fcc high entropy alloys present a paradox: these alloys absorb more H than Ni or SS304 (austenitic 304 stainless steel) while being more resistant to embrittlement. Here, a new theory of embrittlement in fcc metals is presented based on the role of H in driving an intrinsic ductile-to-brittle transition at a crack tip. The theory quantitatively predicts the H concentration at which a transition to embrittlement occurs in good agreement with experiments for SS304, SS316L, CoCrNi, CoNiV, CoCrFeNi, and CoCrFeMnNi. The theory rationalizes why CoNiV is the alloy most resistant to embrittlement and why SS316L is more resistant than the high entropy alloys CoCrFeNi and CoCrFeMnNi, which opens a path for the computationally guided discovery of new embrittlement-resistant alloys.
Files
File preview
files_description.md
All files
References
Journal reference X Zhou, A Tehranchi, WA Curtin, Phys. Rev. Lett. 127,175501(2021), doi: 10.1103/PhysRevLett.127.175501