Effect of hydrogenation on the mechanical property of amorphous Ni90Al10 membranes

Title
Effect of hydrogenation on the mechanical property of amorphous Ni90Al10 membranes
Authors
박경원Shbutani, Yoji
Keywords
Amorphous membrane; Structural change; Hydrogen embrittlement; Mechanical property; Strain localization
Issue Date
2011-06
Publisher
International journal of hydrogen energy
Citation
VOL 36, NO 15, 9324-9334
Abstract
To investigate the mechanism of hydrogen embrittlement in amorphous membranes, changes in the stressestrain curves of an amorphous Ni90Al10 model membrane as a function of hydrogen concentration were examined using Molecular Dynamics (MD) simulations. In addition, the fractional change of short-range ordered (SRO) structures during uniaxial tensile deformation was scrutinized using the Voronoi tessellation method. By correlating these structural evolutions related to volume expansion with changes in the mechanical property, the hydrogen embrittlement phenomenon occurring in the amorphous membrane was discussed with respect to the abrupt increase in the degree of strain localization during deformation. The possibility, not only of hydrogen embrittlement, but also of hydrogen-induced ductility enhancement, was demonstrated by the decrease in the degree of strain localization. Finally, we proposed a fundamental mechanism that can explain these overall phenomena occurring in the amorphous membrane by the introduction of hydrogen.
URI
http://pubs.kist.re.kr/handle/201004/39891
ISSN
0360-3199
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KIST Publication > Article
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