Origin of hydrogen embrittlement in vanadium-based hydrogen separation membranes

Title
Origin of hydrogen embrittlement in vanadium-based hydrogen separation membranes
Authors
고원석전종배심재혁이병주
Keywords
Hydrogen separation membrane; Vanadium; Hydrogen embrittlement; Vanadium-hydrogen; Atomistic simulation; Modified emebedded-atom method; Molecular dynamics
Issue Date
2012-09
Publisher
International journal of hydrogen energy
Citation
VOL 37, NO 18, 13583-13593
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/42982
ISSN
03603199
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KIST Publication > Article
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