Impact of severe plastic deformation on microstructure and hydrogen storage of titanium-iron-manganese intermetallics
Impact of severe plastic deformation on microstructure and hydrogen storage of titanium-iron-manganese intermetallics
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DOI：
10.1016/j.scriptamat.2016.07.007
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发表时间：
2016-11-01
影响因子：
6
通讯作者：
Horita, Zenji
中科院分区：
文献类型：
--
作者：
Edalati, Kaveh;Matsuo, Motoaki;Horita, Zenji
通过高压扭转（HPT）对TiFe_（1-x）Mn_x（x = 0，0.15和0.3）金属间化合物进行了剧烈变形，以提高其加氢活性和耐空气腐蚀性。虽然铸态铸锭几乎不吸收氢（TiFe（0.7）Mn 0（3）在孕育期后表现出缓慢的活化），但HPT处理的样品即使在空气暴露后在室温下也快速吸收氢。储氢性能的提高是由于晶格缺陷和非晶区的形成，它们作为氢扩散的通道。Rietveld分析和第一性原理计算表明，Mn的加入使晶格膨胀，氢化物形成能降低，从而降低了氢化/活化压力。(C)2016爱思唯尔有限公司版权所有
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.