Damping properties of hydrogen-absorbed rod metallic glasses

Internal friction of hydrogen-absorbed Zr–Al–Ni–Cu–Pd metallic glasses has been investigated using rod samples. A broad peak is observed around 230 K in the temperature dependence of internal friction. Strain amplitude and frequency dependences of internal friction have been also investigated. The activation energy of hydrogen jumps and pre-factor estimated from the Arrhenius plots on the basis of the frequency dependence are about 0.4 eV and 3×10−13 s, respectively. Effects of hydrogen concentration on the temperature dependence of internal friction have been also clarified. It is found that the peak temperature decreases with increasing hydrogen concentration and that the peak internal friction increases linearly with hydrogen concentration up to 1 at.%.