Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion
Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion
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DOI：
10.1016/j.ijhydene.2016.03.146
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发表时间：
2016-06-08
影响因子：
7.2
通讯作者：
Horita, Zenji
中科院分区：
文献类型：
--
作者：
Edalati, Kaveh;Shao, Huaiyu;Horita, Zenji
钛钒合金在室温下热力学地吸收氢，但如果没有复杂的活化过程，氢化实际上是不会发生的。本研究以钛、钒粉末为原料，采用高压扭转(HPT)法制备了一种具有超饱和体心立方结构和超高密度刃位错(>；10(16)m(-2))的纳米晶TiV合金。大量晶界和位错的存在作为氢扩散的有效途径，激活了TIV，在室温下经过一段孕育期后，TIV的吸氢量接近4wt.%。动力学测量表明，孕育期的吸氢过程受控于缓慢的氢解离速率，而后期的加氢速率受氢原子扩散控制。0 2016氢能出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
Ti-V alloys thermodynamically absorb hydrogen at room temperature, but hydrogenation does not occur practically without a sophisticated activation process. In this study, a nanograined TiV alloy with the supersaturated bcc structure and an ultrahigh density of edge dislocations (>10(16) m(-2)) was mechanically synthesized from Ti and V powders using the high-pressure torsion (HPT) method. The presence of large fractions of grain boundaries and dislocations, as effective pathways for hydrogen diffusion, activated TiV and it absorbed similar to 4 wt.% of hydrogen at room temperature after an incubation period. The kinetic measurements suggested that the hydrogen absorption in the incubation period is controlled by the slow rate of hydrogen dissociation, while the hydrogenation rate in the latter stage is controlled by diffusion of hydrogen atoms. 0 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.