Abstract
The internal friction of metallic glass Cu 70Ti 30 was investigated in the temperature region from room temperature to 693 K using a conventional torsion pendulum. In the course of isochronal scanning, the internal friction of an as-received specimen increases substantially with temperature from about 373 to 573 K, and a sharp maximum is observed at a temperature of 660 K with a shoulder on its left. X-ray and DSC results show that the peak is mainly related to the transition of an amorphous phase to a metastable phase Cu 3Ti. During isothermal annealing at lower temperatures, the internal friction decreases monotonously with the increase of annealing time, the average activation energy for the decrease of internal friction is about 1.36 eV in the temperature range studied. The internal friction behaviour during structural relaxation was briefly discussed in terms of the atomic-level structural fluctuation theory.
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