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M: Metallphysik

M 7: Glasdynamik

M 7.3: Vortrag

Montag, 8. März 2004, 15:15–15:30, H16

Mechanical spectroscopy of the bulk metallic glasses
Zr_52.5Ti₅Cu_17.9Ni_14.6Al₁₀ and Pd₄₀Cu₃₀Ni₁₀P₂₀. — •Maik Eggers¹, Alexander Strahl¹, V.A. Khonik², and Hartmut Neuhäuser¹ — ¹TU Braunschweig, Institut für Metallphysik u. Nukleare Festkörperphysik, Mendelssohnstr. 3, D-38106 Braunschweig — ²Institute of General Physics, State Pedagogical University, Voronezh, Russia

By means of the vibrating reed technique, measurements of internal friction have been performed in the temperature range of 120 to 800 K during heating and cooling with a constant rate of 2 K/s, in order to monitor the structural relaxation during these thermal treatments. This is compared for bulk glasses (produced with rather low quenching rate) and for the same materials in form of ribbons quenched rapidly from the melt. Special investigation is devoted to a low temperature relaxation peak around 270 K (for first flexural vibration mode between 100 and 400 Hz) which has been found in the Zr-based alloy, and which may arise either from trapped hydrogen or from "dislocations" introduced by plastic deformation into the amorphous structure. Therefore in particular the amplitude dependence of damping has been measured.