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 Mg97Ni3 alloy was processed by melt spinning (MS) and by extensive cold rolling (CR). Submitting Mg97Ni3 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 Mg2Ni nanoparticles. This refined microstructure allied to the developed texture resulted in enhanced activation and H-sorption kinetics properties.
Highlights
Hydrogen is considered the ideal energy carrier due to its high energy content, 120 MJ.kg–1, being the highest among the chemical fuels, and to the fact that only water is obtained after its use in a combustion engine or fuel cell
We present a new route to obtain bulk grain-refined Mg samples, using melt spinning followed by cold rolling
Extensive cold rolling using stainless steel plates has been shown to be a viable procedure to the Mg alloy ribbons, producing cold welded laminated foils with thickness of around 100 μm
Summary
Hydrogen is considered the ideal energy carrier due to its high energy content, 120 MJ.kg–1, being the highest among the chemical fuels, and to the fact that only water is obtained after its use in a combustion engine or fuel cell. Finding effective hydrogen storage solutions remains as a key technological challenge to its widespread use. Metal hydrides can store safely hydrogen in the solid state, avoiding the use of high pressure (gaseous H2) or very low temperatures (liquid hydrogen)[1]. Magnesium is a promising material for hydrogen storage because it has low cost and is fairly accessible. MgH2 has a high hydrogen capacity, of 7.6 wt. Conventional microcrystalline Mg reacts with hydrogen with slow kinetics[2], even at high temperatures such as 400 °C
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