Impact of severe plastic deformation on kinetics and thermodynamics of hydrogen storage in magnesium and its alloys

Magnesium and its alloys are the most investigated materials for solid-state hydrogen storage in form of metal hydrides, but there still unresolved problems with kinetics thermodynamics hydrogenation dehydrogenation this group materials. Severe plastic deformation (SPD) methods, such as equal-channel angular pressing (ECAP), high-pressure torsion (HPT), intensive rolling, fast forging, have been widely used to enhance activation, air resistance, hydrogenation/dehydrogenation Mg-based by introducing ultrafine/nanoscale grains crystal lattice defects. These severely deformed materials, particularly presence alloying additives or second-phase nanoparticles, can show not only absorption/desorption also good cycling stability. It was shown that some apparently inert absorb after SPD processing. Moreover, methods were effectively binding-energy engineering synthesizing new magnesium low thermodynamic stability reversible low/room-temperature storage, nanoglasses, high-entropy alloys, metastable phases including γ-MgH2 polymorph. This work reviews recent advances development processing discusses their potential future applications.