There is great interest in metal-hydrogen systems. When small amounts of hydrogen are absorbed by elemental metals and alloys, the engineering materials made of the systems exhibit strong changes in their physical and mechanical properties. These changes, and hydrogen embrittlement, can be considered detrimental to the structural performance of the materials. However, the changes, often studied by metallurgists and metal physicists, can present new possibilities and applications. An example is the interest in safe, solid-state hydrogen storage in metallic lattices. The effect of elasto-plastic deformation on hydrogen sorption in light metals and hydrides has been studied in an MTL project. It has been observed that high-rate impacting of pure magnesium has an effect on hydrogen storage capacity. Furthermore, analysis of the state of residual stress performed by X-ray diffraction method for the first time in such high-rate, milled materials, indicates a very complex stress distribution dependent on the time of milling. The milling in increments of 10 minutes from 0, original un-milled material, to 30 minutes, indicates extensive changes in the stress states.