Hydrogen loading behaviour of multi-component amorphous alloys: model and experiment

In this paper a model is presented which predicts chemical potential versus hydrogen concentration isotherms for multi-component amorphous alloys. The main assumption of this model is that hydrogen occupies tetrahedral sites within the amorphous alloy. Depending on the concentrations of the constituents and the heats of solution of hydrogen in the pure elements, one obtains a ‘density of energy-sites’ of the material as seen by the hydrogen atoms. Considerations on the effect of blocking of neighbouring sites due to a hydrogen atom located in a certain site will be made. The isotherm resulting from the model after numerical calculation for a ZrCuNiAl alloy is compared with a measured isotherm showing a reasonable consistence.