Abstract
Glassy Zr50Ti5Al10Cu22Ni13 alloy samples were prepared by HF melting and pouring into water-cooled copper mould of 6 mm diameter. The crystallization of these amorphous ingots has been studied by differential scanning calorimetry (DSC) measurements and in-situ neutron diffraction experiments showing that, by increasing temperature, intermediate (metastable) phases appear during heating. The structures of the intermediate and final phases have been determined by Rietveld refinements of X-ray and neutron diffraction data. The hydrogenation of the alloy has been performed by applying the H2 gas pressure on the alloy annealed at different temperatures. The hydrogen uptake is different when applied on the amorphous, intermediate or final phases. The hydride ZrH2 is formed when hydrogen pressure is applied on the amorphous or final phases, the hydride Zr2NiH4 is formed when the pressure is applied on the intermediate phase.
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