Journal
ACTA MATERIALIA
Volume 92, Issue -, Pages 46-54Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.03.036
Keywords
Severe plastic deformation (SPD); Ultrafine-grained (UFG) materials; Metal hydrides; Hydrogenation activation; Carbon-neutral energy
Funding
- Japan Society for Promotion of Science (JSPS) [25889043]
- Light Metals Educational Foundation of Japan
- MEXT, Japan [22102004, 26220909]
- [WPI-I2CNER]
- Grants-in-Aid for Scientific Research [26220909, 15K14183, 25889043] Funding Source: KAKEN
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Mg2Ni intermetallics are processed using three different routes to produce three different microstructural features: annealing at high temperature for coarse grain formation, severe plastic deformation through high-pressure torsion (HPT) for nanograin formation, and HPT processing followed by annealing for the introduction of stacking faults. It is found that both grain boundaries and stacking faults are significantly effective to activate the Mg2Ni intermetallics for hydrogen storage at 423 K (150 degrees C). The hydrogenation kinetics is also considerably enhanced by the introduction of large fractions of grain boundaries and stacking faults while the hydrogenation thermodynamics remains unchanged. This study shows that, similar to grain boundaries and cracks, stacking faults can act as quick pathways for the transportation of hydrogen in the hydrogen storage materials. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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