Abstract
The absorption of hydrogen by means of gas–solid reaction and its consequence on the structure have been studied for fully amorphous alloys as well as quasicrystals/glassy composite alloys based on the composition Zr 59Ti 3Cu 20Al 10Ni 8. The process of hydrogen absorption has been performed and monitored under 20 bar of H 2 using high pressure-differential scanning calorimetry (HP-DSC). The structure evolution of the samples has been followed by X-ray diffractometry (XRD). Results show that the nature of the surface oxide layer strongly affects the process of hydrogen absorption, especially its starting temperature. The structure evolves nevertheless along the same basic sequence, regardless of the sample: (i) the alloys keep a global amorphous structure up to roughly H/M = 0.8 and T = 350 °C; (ii) then ZrH 2 and at higher temperature Cu 2AlZr are formed. The stability of the glass is weakened and the formation of quasicrystals is inhibited under 20 bar of H 2. An heterogeneous distribution of hydrogen atoms inside the amorphous matrix has been inferred from the results.
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