Hydrogen storage of melt-spun amorphous Mg65Ni20Cu5Y10 alloy deformed by high-pressure torsion

Rapidly quenched amorphous Mg65Ni20Cu5Y10 metallic glass compacts were subjected to heavy shear deformation by high-pressure torsion until different amounts of ultimate strain. High-resolution X-ray diffraction analysis and scanning electron microscopy revealed that high-pressure torsion resulted in a deformation dependent microstructure. High-pressure calorimetry measurements revealed that hydrogen uptake in the fully amorphous alloy occurs at a significantly lower temperature compared to the fully crystallized state, while the amount of absorbed hydrogen increased considerably after heavy shear deformation due to the formation of Mg2Ni crystals. ► Rapidly quenched Mg65Ni20Cu5Y10 metallic glass compacts were subjected to heavy shear deformation. ► H-uptake in the amorphous alloy occurs at lower temperature compared to the crystallized state. ► The amount of absorbed hydrogen increased considerably after high-pressure torsion.