Diffusion of hydrogen in amorphous, high deformed and nanocrystalline alloys

The approach, which was proposed earlier for calculation of the chemical diffusion coefficient of hydrogen in alloys and "two-phase" systems, was used to analyze the diffusion behavior of disordered materials taking into account a non-zero partial molar volume of interstitial impurity atoms. Explicit expressions for the hydrogen diffusion coefficient in amorphous metals and alloys and "two-phase" systems have been obtained. The temperature and concentration dependences of permeability of amorphous metals have been determined. The effect of the correlation in the distribution of static fluctuations of the free volume on diffusion properties of amorphous materials has been analyzed. Some limiting cases have been discussed. Types of the diffusion behavior of strongly deformed and nanocrystalline metals have been classified. It was concluded that the transfer of hydrogen under conditions of quasi-volume diffusion is insensitive to the structure of these materials.