Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion
Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion
复制标题
高压扭转处理超细晶钯中的氢行为
DOI：
10.1016/j.ijhydene.2013.08.098
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发表时间：
2013
影响因子：
7.2
通讯作者：
Zenji Horita
中科院分区：
文献类型：
--
作者：
Hideaki Iwaoka;Zenji Horita
对高压扭转（HPT）处理后的超细晶钯进行了氢渗透试验，并与退火后的粗晶钯进行了比较。结果表明，氢扩散在200 °C以上是相似的，但在低于200 °C的温度下在超细晶状态下增强。在氢渗透试验后，对所有样品进行X射线衍射分析。结果表明，氢化物的形成发生在较低的温度下，在粗和超细晶状态，但氢化物的形成温度降低到一个较低的温度在超细晶状态。研究表明，钯的晶界作为扩散通道，而不是作为氢化物形成的网站。
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.