Origin of hydrogen embrittlement in vanadium-based hydrogen separation membranes
- Origin of hydrogen embrittlement in vanadium-based hydrogen separation membranes
- 고원석; 전종배; 심재혁; 이병주
- Hydrogen separation membrane; Vanadium; Hydrogen embrittlement; Vanadium-hydrogen; Atomistic simulation; Modified emebedded-atom method; Molecular dynamics
- Issue Date
- International journal of hydrogen energy
- VOL 37, NO 18, 13583-13593
- Hydrogen embrittlement in metals is a challenging technical issue in the proper use of
hydrogen energy. Despite extensive investigations, the underlying mechanism has not been
clearly understood. Using atomistic simulations, we focused on the hydrogen embrittlement
in vanadium-based hydrogen separation membrane. We found that, contrary to the
conventional reasoning for the embrittlement of vanadium, the hydrogen-enhanced localized
plasticity (HELP) mechanismis the most promising mechanism. Hydrogen enhances the
nucleation of dislocations near the crack tip, which leads to the localized plasticity, and
eventually enhances the void nucleation that leads to the failure. Those results provide an
insight into the complex atomic scale process of hydrogen embrittlement in vanadium and
also help us design a new alloy for hydrogen separation membranes.
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- KIST Publication > Article
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