Abstract

Composite Mg 2Ni (25 wt.%) amorphous Mg 50Ni 50 was prepared by mechanical milling starting with nanocrystalline Mg 2Ni and amorphous Mg 50Ni 50 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 363 K under an initial hydrogen pressure of 2 MPa. The dehydriding behavior was studied by differential thermogravimetry. On the basis of the results, it is possible to conclude that amorphous Mg 50Ni 50 improved the hydriding and dehydriding kinetics of Mg 2Ni alloy upon cycling. A tentative rationalization of experimental observations is proposed. © 2011 Elsevier Inc. All rights reserved.