LAUSR

Abstract In the article, melt spinning was successfully applied to prepare Mg25-xYxNi9Cu (x = 0, 1, 3, 5, 7) alloys. The alloys were detected by the equipment of TEM and XRD to describe the structure of the alloys. Sievert’s apparatus, DSC and TGA connected with a H2 detector were utilized to investigate properties of absorbing and desorbing hydrogen. We utilized Arrhenius and Kissinger methods to reckon activation energy for desorbing hydrogen from the alloy hydrides. It is found that melt spinning and Y substitution for Mg visibly decrease the thermodynamic parameters (ΔH and ΔS) as well as make starting hydrogen desorption temperature obviously decline. For this kind of alloy, Y taking place of Mg distinctly decreases the hydrogen absorption capacity. The hydrogen absorption capacity augments at first and afterward declines following spinning rate increasing. Y replacing Mg and melt spinning slightly impair the kinetics for absorbing hydrogen, but make the kinetics for desorbing hydrogen significantly improved. The activation energy of desorbing hydrogen from the alloys markedly lowers following the proportion of Y and spinning rate increasing, which is identified as the root-cause that affect the velocity of hydrogen desorption reaction.