Abstract
Magnesium alloys take a special place among the hydrogen storage materials, mainly due to their high gravimetric (7.6 mass%) and volumetric (110 kgm-3) hydrogen storage capacity. Unfortunately, the kinetics of hydrogenation and hydrogen release are rather slow, which limits practical use of magnesium-based materials for hydrogen and heat storage. Refining the microstructure of magnesium alloys, ideally down to nanoscale, is known to accelerate the hydrogenation/dehydrogenation kinetics. A possible way to achieve that is by severe plastic deformation. Our first demonstration of this effect through processing of a Mg alloy (ZK60) by equal-channel angular pressing prompted a stream of further studies employing severe plastic deformation techniques to improve the hydrogen storage-relevant properties of Mg alloys. The present article provides an overview of the literature on the subject, with a natural focus on our own data.
Highlights
Hydrogen storage is a key element of hydrogen economy, and a lot of effort goes into developing viable solutions to this critical need
The encouraging results of that study in terms of faster reversible hydrogenation/dehydrogenation prompted other researchers to pursue this processing route, and a significant number of publications reporting their results ensued. While these studies still constitute a niche research area, the interest in the potential of severe plastic deformation (SPD) as a means of combating the unfavorable thermodynamics and kinetics of hydrogenation of Mg alloys is great, and we feel that a “mini-review” of this area would be conducive for promoting it to a broader research community
We are of the opinion that the most promising way of improving the thermodynamics of the Mg-H system is to combine the SPD techniques with multicomponent alloying, preferably with light elements
Summary
Magnesium alloys take a special place among the hydrogen storage materials, mainly due to their high gravimetric (7.6 mass %) and volumetric (110 kg m−3) hydrogen storage capacity. The kinetics of hydrogenation and hydrogen release are rather slow, which limits practical use of magnesium-based materials for hydrogen and heat storage. Refining the microstructure of magnesium alloys, ideally down to nanoscale, is known to accelerate the hydrogenation/dehydrogenation kinetics. A possible way to achieve that is by severe plastic deformation. Our first demonstration of this effect through processing of a Mg alloy (ZK60) by equal-channel angular pressing prompted a stream of further studies employing severe plastic deformation techniques to improve the hydrogen storage-relevant properties of Mg alloys. The present article provides an overview of the literature on the subject, with a natural focus on our own data
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