Significance of grain boundaries and stacking faults on hydrogen storage properties of Mg2Ni intermetallics processed by high-pressure torsion

Toshifumi Hongo, Kaveh Edalati, Makoto Arita, Junko Matsuda, Etsuo Akiba, Zenji Horita

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

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 °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.

Original languageEnglish
Pages (from-to)46-54
Number of pages9
JournalActa Materialia
Volume92
DOIs
Publication statusPublished - Jun 15 2015

Fingerprint

Stacking faults
Hydrogen storage
Torsional stress
Intermetallics
Grain boundaries
Hydrogenation
Annealing
Hydrogen
Plastic deformation
Thermodynamics
Cracks
Kinetics
Processing
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Significance of grain boundaries and stacking faults on hydrogen storage properties of Mg2Ni intermetallics processed by high-pressure torsion. / Hongo, Toshifumi; Edalati, Kaveh; Arita, Makoto; Matsuda, Junko; Akiba, Etsuo; Horita, Zenji.

In: Acta Materialia, Vol. 92, 15.06.2015, p. 46-54.

Research output: Contribution to journalArticle

@article{8e50952969b840c1be8eb8430dde09e9,
title = "Significance of grain boundaries and stacking faults on hydrogen storage properties of Mg2Ni intermetallics processed by high-pressure torsion",
abstract = "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 °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.",
author = "Toshifumi Hongo and Kaveh Edalati and Makoto Arita and Junko Matsuda and Etsuo Akiba and Zenji Horita",
year = "2015",
month = "6",
day = "15",
doi = "10.1016/j.actamat.2015.03.036",
language = "English",
volume = "92",
pages = "46--54",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Significance of grain boundaries and stacking faults on hydrogen storage properties of Mg2Ni intermetallics processed by high-pressure torsion

AU - Hongo, Toshifumi

AU - Edalati, Kaveh

AU - Arita, Makoto

AU - Matsuda, Junko

AU - Akiba, Etsuo

AU - Horita, Zenji

PY - 2015/6/15

Y1 - 2015/6/15

N2 - 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 °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.

AB - 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 °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.

UR - http://www.scopus.com/inward/record.url?scp=84927659003&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84927659003&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2015.03.036

DO - 10.1016/j.actamat.2015.03.036

M3 - Article

AN - SCOPUS:84927659003

VL - 92

SP - 46

EP - 54

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -