Abstract
The main characteristics of creep and diffusion data in metallic amorphous alloys (PdSi and FeNiB types) are presented. It is shown that the “free volume model” cannot satisfactorily explain these data, particularly the different behaviour of diffusion and creep with respect to the kinetics of relaxation. Finally it is shown that the creep behaviour of metglas is qualitatively similar to that of polycrystals at high temperature and that, from a macroscopic point of view, Nabarro-Herring (or Coble) model are able to account for creep and diffusion experiments. We also discuss, from an atomistic point of view, the two defects which are involved in this model: equilibrium “diffusion” defect and sinks out of equilibrium.
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