Effect of amorphous Mg50Ni50 on hydriding and dehydriding behavior of Mg2Ni alloy

Composite Mg2Ni (25wt.%) amorphous Mg50Ni50 was prepared by mechanical milling starting with nanocrystalline Mg2Ni and amorphous Mg50Ni50 powders, by using a SPEX 8000 D mill. The morphological and microstructural characterization of the powders was performed via scanning electron microscopy and X-r...

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Bibliographic Details
Published in:Materials characterization 2011-04, Vol.62 (4), p.442-450
Main Authors: Guzmán, D., Ordoñez, S., Fernández, J.F., Sánchez, C., Serafini, D., Rojas, P.A., Aguilar, C., Tapia, P.
Format: Article
Language:English
Subjects:
Cycles
Diffraction
Mechanical milling
Microstructure
Mills
Nanocrystals
Thermogravimetry
X-rays
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Summary:Composite Mg2Ni (25wt.%) amorphous Mg50Ni50 was prepared by mechanical milling starting with nanocrystalline Mg2Ni and amorphous Mg50Ni50 powders, by using a SPEX 8000 D mill. The morphological and microstructural characterization of the powders was performed via scanning electron microscopy and X-ray diffraction. The hydriding characterization of the composite was performed via a solid gas reaction method in a Sievert's-type apparatus at 363K under an initial hydrogen pressure of 2MPa. The dehydriding behavior was studied by differential thermogravimetry. On the basis of the results, it is possible to conclude that amorphous Mg50Ni50 improved the hydriding and dehydriding kinetics of Mg2Ni alloy upon cycling. A tentative rationalization of experimental observations is proposed.
ISSN:1044-5803
DOI:10.1016/j.matchar.2011.02.007