Article ID Journal Published Year Pages File Type
5459879 Journal of Alloys and Compounds 2017 6 Pages PDF
Abstract
Nanocrystalline and amorphous microstructures prepared by rapid solidification (RS) processing are effective in improving the absorption/desorption kinetics of the Mg-based hydrogen storage alloys. In this paper, the as-cast, nanocrystalline and amorphous Mg-5Ni-3La (at.%) alloys were prepared, and effects of microstructure on the hydrogen storage properties of the alloys were studied. The nanocrystalline and amorphous Mg-5Ni-3La (at.%) alloys show better absorption/desorption kinetics than that of the as-cast alloy due to the smaller grain size and more grain boundaries. The values of ΔH (enthalpy) for the Mg-H2 system of the nanocrystalline and amorphous alloys are −74.0 ± 1.2 kJ mol−1 and -66.1 ± 3.4 kJ mol−1, respectively, which are significantly lower compared to that of the as-cast alloy (−77.7 ± 0.3 kJ mol−1).
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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