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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of substitutional elements on the hydrogen absorption-desorption properties of Ti_3Al compounds
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Effect of substitutional elements on the hydrogen absorption-desorption properties of Ti_3Al compounds

机译：取代元素对Ti_3Al化合物氢吸收-解吸性能的影响

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摘要

Ternary elements M were substituted into Ti_3Al with the aim of reducing the hydrogen desorption temperature of Ti_3AlH_x. On hydrogenation at room temperature, three different states, i.e. amorphous, bcc and C14 Laves phases, were obtained depending on the alloying elements and their amount. The amorphous hydrides formed in the alloys substituted with Zr or Hf showed a high hydrogen capacity and high hydrogen desorption temperature. In the case of the bcc hydrides, formed in the alloys substituted with V or Cr, the hydrogen capacity was largely reduced, but the hydrogen desorption temperature was unchanged or increased. Therefore, V and Cr are the worst substitutional elements to Ti_3Al. On the other hand, the hydrides having C14 Laves structure formed in the alloys substituted with Mn, Co or Ni showed a reduced hydrogen desorption temperature, although the hydrogen capacity was decreased to same extent. From the present work, Mn, Co and Ni are considered to be effective elements for improvement of the hydrogen absorption-desorption properties of Ti_3Al.
机译：为了降低Ti_3AlH_x的氢解吸温度，将三元元素M代入Ti_3Al。在室温下氢化时，取决于合金元素及其含量，获得了三种不同的状态，即无定形，bcc和C14 Laves相。用Zr或Hf取代的合金中形成的无定形氢化物显示出高氢容量和高氢解吸温度。在用V或Cr取代的合金中形成bcc氢化物的情况下，氢容量大大降低，但氢解吸温度不变或升高。因此，V和Cr是Ti_3Al的最差的取代元素。另一方面，用Mn，Co或Ni替代的合金中形成的具有C14Laves结构的氢化物显示出降低的氢解吸温度，尽管氢容量降低了相同程度。从目前的工作来看，Mn，Co和Ni被认为是改善Ti_3Al的氢吸收-解吸性能的有效元素。

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