High-pressure torsion for new hydrogen storage materials

Abstract

High-pressure torsion (HPT) is widely used as a severe plastic deformation technique to create ultrafine-grained structures with promising mechanical and functional properties. Since 2007, the method has been employed to enhance the hydrogenation kinetics in different Mg-based hydrogen storage materials. Recent studies showed that the method is effective not only for increasing the hydrogenation kinetics but also for improving the hydrogenation activity, for enhancing the air resistivity and more importantly for synthesizing new nanostructured hydrogen storage materials with high densities of lattice defects. This manuscript reviews some major findings on the impact of HPT process on the hydrogen storage performance of different titanium-based and magnesium-based materials.

Keywords

• Solid-state hydrogen storage
• metal hydrides
• carbon-neutral energy
• severe plastic deformation (SPD)
• nanostructured materials
• ultrafine grain (UFG)
• lattice defects
• grain boundaries
• Mg-based alloys
• Ti-based intermetallics