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M: Metallphysik

M 9: Quasikristalle III

M 9.4: Vortrag

Montag, 24. März 2003, 15:30–15:45, IFW B

Hydrogen-induced damping peaks in Ti-Zr-Ni quasicrystals — •Igor Golovin¹, Hans-Rainer Sinning¹, and Adrian Jianu² — ¹Institut für Werkstoffe, TU Braunschweig, Langer Kamp 8, 38106 Braunschweig — ²Physik neuer Materialien, Univ. Rostock, August-Bebel-Str. 55, 18051 Rostock

Hydrogen-induced mechanical loss peaks, ascribed to a Snoek-type reorientation relaxation in icosahedral quasicrystals, were measured on melt-spun Ti-Zr-Ni alloys (compositions between Ti₅₃Zr₂₇Ni₂₀ and Ti₄₁Zr₄₂Ni₁₇ ) using the vibrating-reed technique. In a range of H concentrations between ∼ 0.001 and 0.1 H/M, we find differences in the properties of these relaxation peaks between different alloy compositions, like an increase in the local H diffusivity in the sequence Zr_69.5Cu₁₂Ni₁₁Al_7.5 – Ti₅₃Zr₂₇Ni₂₀ – Ti₄₁Zr₄₂Ni₁₇ , combined with some changes in width and shape of the peak. These differences are discussed with respect to the question how far they reflect different short-range order in the respective icosahedral phases.