Hydrogenation of Zr-based metallic glasses and quasicrystals
نویسندگان
چکیده
Zr-based metallic glasses and quasicrystals were electrochemically charged with hydrogen. Hydrogen absorption/ desorption as well as the in ̄uence of hydrogen on the formation and stability of quasicrystals were studied by means of X-ray diraction, electron microscopy, dierential scanning calorimetry (DSC) and thermal desorption analysis (TDA). In Zr69:5Cu12Ni11Al7:5 absorption kinetics and storage capacity were found to be better for the quasicrystalline than for the associated amorphous phase. Dissolved hydrogen was observed to play an important role not only in the stability of the quasicrystals, but also in their formation from glassy precursor material. Even hydrogen contents as low as 5 at.% changed the formation as well as the decomposition of the icosahedral quasicrystals: the formation was shifted to higher temperatures whereas decomposition temperatures were lowered. At larger hydrogen contents, changes in both transformations were observed, yet not fully understood. Ó 1999 Elsevier Science B.V. All rights reserved.
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