Abstract
Glassy Zr 65Cu 17.5Al 7.5Ni 10 alloy samples with 0.13 and 0.46 at.% oxygen were prepared by single-roller melt-spinning. Subsequently, the ribbons were electrolytically charged to different hydrogen-to-metal ratios 0.035≤H/M≤1.6. The effect of hydrogen on the thermal stability and on the crystallisation behaviour of the alloy samples was studied by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). With increasing hydrogen content, a reduction of the undercooled liquid region and a significant change in the crystallisation process was observed. Hydrogen was found to suppress the oxygen-triggered formation of the metastable quasicrystalline phase, whereas the metastable f.c.c.-phase formation seems to be less affected. Furthermore, hydrogen-induced copper segregation was detected after long-term charging to high H/M ratios at room temperature and already for samples with low hydrogen contents upon heating. At very high H/M ratios, the thermal behaviour of the investigated Zr 65Cu 17.5Al 7.5Ni 10 alloy samples is determined by preferential zirconium hydride formation and successive decomposition causing the formation of new stable intermetallic phases with lower zirconium content.
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