Abstract
Two nanocrystalline magnesium-rich alloys, Mg 90Ni 10 and Mg 80Ni 10Y 10, were produced by melt-spinning. After hydrogenation they consist of a MgH 2 matrix with finely dispersed Mg 2NiH 4 grains of about 2 μm in size. In the case of Mg 80Ni 10Y 10, nanocrystalline YH 3 grains are found, additionally. The desorption kinetics of hydrogenated Mg 90Ni 10 and Mg 80Ni 10Y 10 was investigated by thermogravimetry at different temperatures in the range from 150 °C to 250 °C. It was observed that Mg 80Ni 10Y 10 exhibits a much faster desorption kinetics in comparison to Mg 90Ni 10 of up to 1.3 wt.% H 2/min. Differential scanning calorimetry indicates that these alloys undergo a two-step desorption process. The corresponding phase transformations were investigated in detail by in situ synchrotron X-ray diffraction, thus, the different hydrogen desorption kinetics can be explained.
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