Magnesium-Nickel alloy for hydrogen storage produced by melt spinning followed by cold rolling

Abstract

Severe plastic deformation routes (SPD) have been shown to be attractive for short time preparation of magnesium alloys for hydrogen storage, generating refined microstructures and interesting hydrogen storage properties when compared to the same materials processed by high-energy ball milling (HEBM), but with the benefit of higher air resistance. In this study, we present results of a new processing route for Mg alloys for hydrogen storage: rapid solidification followed by cold work. A Mg 97 Ni 3 alloy was processed by melt spinning (MS) and by extensive cold rolling (CR). Submitting Mg 97 Ni 3 ribbons between steel plates to cold rolling has shown to be a viable procedure, producing a thin cold welded foil, with little material waste. The as-processed material presents a high level of [002] fiber texture, a sub microcrystalline grain structure with a high density of defects, and also a fine dispersion of Mg 2 Ni nanoparticles. This refined microstructure allied to the developed texture resulted in enhanced activation and H-sorption kinetics properties.

Hydrogen Storage in Mg and Mg-Based Alloys and Composites Processed by Severe Plastic Deformation

“…These results pointed out important features to be controlled in bulk samples such as the deformation texture and the surface to volume ratio. The same tendency was observed in melt-spun MgNi alloy; 50) cold rolling of the MS ribbons improved the kinetics of hydrogen absorption and desorption significantly.…”

Enhancing Hydrogen Storage Properties of Metal Hybrides

“…Amira and Huot [36] various magnesium alloys that were synthesized by conventional casting and by die casting, the latter having a smaller grain size. Leiva et al [38] synthesized Mg 97 Ni 3 alloy by melt spinning and afterward subjected the ribbons to CR. They found that most alloys have better hydrogen storage properties than pure magnesium but surprisingly, the as-cast versions had better kinetics than their die-cast counterpart despite having bigger grain size.…”

Severely deformed ZK60 + 2.5% Mm alloy for hydrogen storage produced by two different processing routes

“…Fine microstructures (preferably nanostructured) correspond to one of the most frequently used solutions to improve the hydrogen storage properties of magnesium [5]. This type of microstructures can be either obtained in the form of powders, by high-energy ball milling [6,7], or in the bulk form, by melt spinning [8,9] and severe plastic deformation techniques [10,11].…”

“…In some cases, MS also leads to the formation of an amorphous phase [20], which typically is crystallized to generate fine grains before hydrogenation. Reports of good hydrogen storage properties have been published with several different systems like MgeNi [8] and MgeNieCu [20] and MgeNieY [9]. However, until the present moment, no research work has been published on MS of ZK60 alloy modified with mischmetal addition.…”