Effects of mechanical processing on the kinetics of H2 absorption in Mg2Ni alloys

This work is aimed at quantifying mechanochemical effects in reactive solid–gas systems. It deals in particular with the kinetics of H2 absorption processes on a Mg2Ni/Ni composite under thermal and mechanical activation. In a first series of experiments, powders were exposed to H2 under static conditions for selected time intervals and successively subjected to mechanical treatment. In a second series, the latter was instead started in coincidence with the exposure of powders to H2. The effects of mechanical processing on the H2 absorption processes have been quantified via the accurate description of the absorption kinetics with suitable model curves. A tentative rationalization of experimental observations is proposed.