TY - JOUR
T1 - Activation of TiFe for hydrogen storage by plastic deformation using groove rolling and high-pressure torsion
T2 - Similarities and differences
AU - Edalati, Kaveh
AU - Matsuda, Junko
AU - Yanagida, Akira
AU - Akiba, Etsuo
AU - Horita, Zenji
N1 - Funding Information:
One of the authors (KE) thanks the Japan Society for Promotion of Science (JSPS) for a Grant-in-Aid for Research Activity under the title of “Mechanism of Activation of TiFe for Hydrogen Storage by High-Pressure Torsion” (no. 25889043 ). This work was supported in part by WPI-I2CNER, and in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan , in Innovative Areas “Bulk Nanostructured Metals” (no. 22102004 ).
Publisher Copyright:
© 2014 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
PY - 2014/9/23
Y1 - 2014/9/23
N2 - Intermetallics of TiFe were processed using three different routes: annealing, plastic deformation using groove rolling and severe plastic deformation using high-pressure torsion (HPT). Hydrogen absorption was less than 0.2 wt.% in the coarse-grained annealed sample because of difficult activation. The groove-rolled sample, with subgrain structure and high density of dislocations and cracks, absorbed 0.3, 1.0, 1.4 and 1.7 wt.% of hydrogen in the first, second, third and fourth hydrogenation cycles, respectively. The HPT-processed sample, containing nanograins, absorbed 1.7-2 wt.% of hydrogen in any hydrogenation cycles. Both samples activated by groove rolling and HPT were not deactivated by long time exposure to the air. No surface segregation was detected after groove rolling, while the HPT-processed sample exhibited surface segregation. The current study confirmed the significance of plastic deformation and formation of grain boundaries and cracks on activation for hydrogen storage.
AB - Intermetallics of TiFe were processed using three different routes: annealing, plastic deformation using groove rolling and severe plastic deformation using high-pressure torsion (HPT). Hydrogen absorption was less than 0.2 wt.% in the coarse-grained annealed sample because of difficult activation. The groove-rolled sample, with subgrain structure and high density of dislocations and cracks, absorbed 0.3, 1.0, 1.4 and 1.7 wt.% of hydrogen in the first, second, third and fourth hydrogenation cycles, respectively. The HPT-processed sample, containing nanograins, absorbed 1.7-2 wt.% of hydrogen in any hydrogenation cycles. Both samples activated by groove rolling and HPT were not deactivated by long time exposure to the air. No surface segregation was detected after groove rolling, while the HPT-processed sample exhibited surface segregation. The current study confirmed the significance of plastic deformation and formation of grain boundaries and cracks on activation for hydrogen storage.
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U2 - 10.1016/j.ijhydene.2014.07.124
DO - 10.1016/j.ijhydene.2014.07.124
M3 - Article
AN - SCOPUS:84908231413
SN - 0360-3199
VL - 39
SP - 15589
EP - 15594
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 28
ER -
