Mechanism of activation of TiFe intermetallics for hydrogen storage by severe plastic deformation using high-pressure torsion

被引：98

作者：

Edalati, Kaveh ^{[1
,2
]}

Matsuda, Junko ^{[1
,3
]}

Arita, Makoto ^{[2
]}

Daio, Takeshi ^{[4
]}

Akiba, Etsuo ^{[1
,4
]}

Horita, Zenji ^{[1
,2
]}

机构：

[1] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, WPI, Fukuoka 8190395, Japan

[2] Kyushu Univ, Dept Mat Sci & Engn, Fac Engn, Fukuoka 8190395, Japan

[3] Kyushu Univ, Dept Mech Engn, Fac Engn, Fukuoka 8190395, Japan

[4] Kyushu Univ, Int Res Ctr Hydrogen Energy, Fukuoka 8190395, Japan

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 14期

关键词：

GRAIN SIZES; DIFFUSION; FETI; NANOSTRUCTURE; MAGNESIUM; HYDRIDE; ALLOYS; STEEL;

D O I：

10.1063/1.4823555

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

TiFe, a potential candidate for solid-state hydrogen storage, does not absorb hydrogen without a sophisticated activation process because of severe oxidation. This study shows that nanostructured TiFe becomes active by high-pressure torsion (HPT) and is not deactivated even after storage for several hundred days in the air. Surface segregation and formation of Fe-rich islands and cracks occur after HPT. The Fe-rich islands are suggested to act as catalysts for hydrogen dissociation and cracks and nanograin boundaries act as pathways to transport hydrogen through the oxide layer. Rapid atomic diffusion by HPT is responsible for enhanced surface segregation and hydrogen transportation. (C) 2013 AIP Publishing LLC.

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页数：4

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