Impact of severe plastic deformation on microstructure and hydrogen storage of titanium-iron-manganese intermetallics

被引：64

作者：

Edalati, Kaveh ^{[1
,2
]}

Matsuo, Motoaki ^{[3
]}

Emami, Hoda ^{[1
]}

Itano, Shota ^{[4
]}

Alhamidi, Ali ^{[5
]}

Staykov, Aleksandar ^{[1
]}

Smith, David J. ^{[6
]}

Orimo, Shin-ichi ^{[3
,7
]}

Akiba, Etsuo ^{[1
]}

Horita, Zenji ^{[1
,2
]}

机构：

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

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

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

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

[5] Sultan Ageng Tirtayasa Univ, Dept Met & Mat Engn, Fac Engn, Cilegon 42435, Indonesia

[6] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

[7] Tohoku Univ, AIMR, Sendai, Miyagi 9808577, Japan

来源：

SCRIPTA MATERIALIA | 2016年 / 124卷

关键词：

Nanostructured intermetallics; Metal hydrides; Activation; High-pressure torsion (HPT); Density functional theory (DFT); HIGH-PRESSURE TORSION; AUGMENTED-WAVE METHOD; MAGNESIUM; FETI; CAPABILITY; HYDRIDE; ALLOYS;

D O I：

10.1016/j.scriptamat.2016.07.007

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

TiFe1-xMnx intermetallics (x = 0, 0.15 and 0.3) were severely deformed by high-pressure torsion (HPT) to enhance their activation and air resistivity for hydrogenation. While the as-cast ingots hardly absorbed hydrogen (TiFe(0.7)Mno(3) exhibited slow activation after an incubation period), the HPT-processed samples absorbed hydrogen quickly at room temperature even after air exposure. The improvement of hydrogen storage performance was due to the formation of lattice defects and amorphous regions, which act as channels for hydrogen diffusion. Rietveld analyses and first-principles calculations showed that Mn addition expands the lattice and reduces the hydride formation energy, and thus decreases the hydrogenation/activation pressure. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：108 / 111

页数：4

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