Dislocation-like relaxations in cold deformed metallic glasses

Abstract

The results of low temperature (30–300 K) low frequency (10 2–10 3) Hz) internal friction investigations of cold deformed metallic glasses (MGs) are summarized. It is shown that inhomogeneous deformation results in a number of internal friction anomalies which are almost identical to those in predeformed crystalline metals. Internal friction of as-cast MGs has no peculiarities. The main features of damping in cold-worked MGs consist in the appearance of (i) large relaxation internal friction peaks analogous to the well-known Hasiguti peaks in crystals and (ii) hysteresis damping which can be suppressed by large predeforming or irradiation. It is argued that inhomogeneous deformation of glassy structures results in the appearance of new dislocation-like defects, not characteristic of the as-cast state, which determine the observed anelastic anomalies.