TY - JOUR
T1 - Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion
AU - Iwaoka, Hideaki
AU - Horita, Zenji
N1 - Funding Information:
One of the authors (HI) thanks the Japan Society for Promotion of Science (JSPS) for a postdoctoral scholarship for “Development of Hydrogen Storage Alloys Using Giant Straining Process”. This work was supported in part by WPI-I2CNER, in part by the Light Metals Educational Foundation of Japan, in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan , in Innovative Areas “Bulk Nanostructured Metals” and in part by Kyushu University Interdisciplinary Programs in Education and Projects in Research Development (P&P).
PY - 2013/11/13
Y1 - 2013/11/13
N2 - Hydrogen permeation tests were carried out on ultrafine-grained palladium processed by high-pressure torsion (HPT) and the results were compared with those on an annealed coarse-grained state. It is shown that hydrogen diffusion is similar above 200 C but is enhanced at temperatures below 200 C in the ultrafine-grained state. All samples were subjected to X-ray diffraction analyses after the hydrogen permeation tests. It is shown that hydride formation occurs at lower temperatures in both coarse- and ultrafine-grained states but the hydride formation temperature is reduced to a lower temperature in the ultrafine-grained state. This study suggests that grain boundaries of palladium act as diffusion pass but not as the sites for hydride formation.
AB - Hydrogen permeation tests were carried out on ultrafine-grained palladium processed by high-pressure torsion (HPT) and the results were compared with those on an annealed coarse-grained state. It is shown that hydrogen diffusion is similar above 200 C but is enhanced at temperatures below 200 C in the ultrafine-grained state. All samples were subjected to X-ray diffraction analyses after the hydrogen permeation tests. It is shown that hydride formation occurs at lower temperatures in both coarse- and ultrafine-grained states but the hydride formation temperature is reduced to a lower temperature in the ultrafine-grained state. This study suggests that grain boundaries of palladium act as diffusion pass but not as the sites for hydride formation.
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U2 - 10.1016/j.ijhydene.2013.08.098
DO - 10.1016/j.ijhydene.2013.08.098
M3 - Article
AN - SCOPUS:84886723600
VL - 38
SP - 14879
EP - 14886
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 34
ER -
