Internal-friction peaks of hydrogen in amorphous and crystalline Co33Zr67

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Abstract
The hydrogen-induced internal-friction spectra, for hydrogen concentrations below 10 at.%, are measured in the different crystallization stages of amorphous Co33Zr67 at various temperatures and frequencies using the vibrating-reed technique. Four internal-friction peaks are observed and analysed with respect to the underlying relaxation mechanisms. Three of them can be attributed to Snoek-type relaxation processes caused by thermally activated jumps of H atoms between neighbouring Zr4 tetrahedral sites in (i) the amorphous phase, (ii) the grain boundaries of a metastable, nanocrystalline state of cubic CoZr2, and (iii) the crystal lattice of the tetragonal CoZr2 equilibrium phase, respectively. Structural and microstructural implications of these results are outlined.