Influence of external stretching on hydrogen electromigration in Pd and PdCu, PdAg alloys

Influence of external stretching of Pd and Pd77Cu23 and Pd77Ag23 alloys on hydrogen electromigration in these systems was investigated. The electro-resistivity method was applied in the investigations. It was found that in order to furnish a full description of the kinetics and dynamics transport of hydrogen in the externally applied electric field to samples in the state of elastic and plastic stretching, it is not sufficient to provide a functional dependence of two commonly used parameters (diffusion coefficient D and effective valence Z eff) on degree of deformation. To describe the electromigration in these conditions a mathematical model was applied, which assumes the existence of two diffusion mechanisms: interstitial and defect-interstitial ones, each of which is characterized by the above-mentioned parameters. For each of the mechanisms, the dependence of these values on external stretching was determined