Hydrogen desorption properties of melt-spun and hydrogenated Mg-based alloys using in situ synchrotron X-ray diffraction and TGA

Three magnesium-based alloys, Mg₉₀Ni₁₀, Mg₈₀Ni₁₀Y₁₀ and Mg₈₅Cu₅Ni₅Y₅, were prepared by melt-spinning and compared regarding their hydrogen desorption properties.Their hydrogen desorption kinetics after activation and hydrogenation was investigated by thermogravimetry at different temperatures in the range from150 °C to 250 °C. It was found that Mg80Ni10Y10 exhibits a much faster desorption kinetics in comparison toMg₉₀Ni₁₀ and Mg₈₅Cu₅Ni₅Y₅ of upto1.3wt.%-H2/min. The corresponding crystal phase transformations were investigated in detail by insitu synchrotron X-ray diffraction. It was found that the kinetics of hydrogenation is controlled by different reaction pathways for Mg₉₀Ni₁₀, Mg₈₀Ni₁₀Y₁₀ and Mg₈₅Cu₅Ni₅Y₅.