It was recalled that experimental and simulation results had revealed deviations from the Arrhenius law for H diffusion in metallic glasses. The deviation was usually attributed to the existence of various types of jump, or to the existence of a continuous distribution of activation energies which were due to various kinds of disorder. A new model was suggested here which related this deviation to a temperature-dependence of the short-range order. This model was applied to the diffusive behavior of H in dilute amorphous Fe-H, Fe-Si-H and Fe-B-H alloys. The effect of alloying elements upon the activation energy for H diffusion in amorphous Fe was explained in terms of their electronic structure and mean volume.

A New Model for the Diffusion Behavior of Hydrogen in Metallic Glasses. N.Eliaz, D.Fuks, D.Eliezer: Acta Materialia, 1999, 47[10], 2981-9