Low temperature (30 to 300K) internal friction was studied in a metallic glass that had been subjected to inhomogeneous deformation by cold-rolling, homogeneous tensile deformation or electrolytic H-charging. It was found that cold rolling or hydrogenation resulted in the appearance of similar internal friction peaks and hysteresis damping. Homogeneous deformation had no effect upon low-temperature internal friction. Microplastic deformation was detected during the hydrogenation of weakly stressed samples. It was argued that microplastic deformation of metallic glasses also occurred during hydrogenation, with no external stress. Plastic flow during both cold-rolling and hydrogenation occurred via the formation and motion of dislocation-like defects which were the cause of the observed anelastic anomalies. It was concluded that reported low-temperature internal friction peaks for as-cast, cold-deformed and hydrogenated samples had a common dislocation-like cause.

V.A.Khonik, L.V.Spivak: Acta Materialia, 1996, 44[1], 367-81