Hydriding-Dehydriding Properties of Mg-Rich Mg-Ni-Nd Alloys with Refined Microstructures
Hydriding-Dehydriding Properties of Mg-Rich Mg-Ni-Nd Alloys with Refined Microstructures
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DOI：
10.2320/matertrans.43.1732
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发表时间：
2002-07
影响因子：
1.2
通讯作者：
J. Yin;Kazuhide Tanaka
中科院分区：
文献类型：
--
作者：
J. Yin;Kazuhide Tanaka
比较了不同凝固工艺(铸态、水淬法和旋转法)制备的富镁Mg-Ni-ND合金的吸放氢特性、压力成分等温线和X射线衍射图，并与扫描电子显微镜观察到的微观组织进行了比较和讨论。其中，通过熔体旋压和后续退火制备的合金具有最好的储氢性能。在423K以上能快速吸氢至∼质量分数为5.0%，在453K以上能以中等速度完全解吸。这些增强的吸附/脱附动力学完全是由于合金的精细组织，包括在镁基质中的Mg2Ni和Nd2H5析出物以及ND氢化物的催化作用所致。
The hydriding/dehydriding characteristics, pressure-composition isotherms and X-ray diffractographs of Mg-rich Mg-Ni-Nd alloys fabricated by different solidifying processes (mold-casting, water-quenching, or melt-spinning) are compared and discussed in relation with their microstructures observed by SEM. Among them, the alloy prepared by melt-spinning and subsequent annealing presents best hydrogen-storage properties. It can quickly absorb hydrogen up to ∼5.0 mass% above 423 K and can wholly desorb it above 453 K with moderate speeds. These enhanced absorption/desorption kinetics are exclusively caused by a refined microstructure of the alloy involving Mg 2 Ni and Nd 2 H 5 precipitates in a Mg matrix as well as by a catalytic action of the Nd-hydride.