The transient diffusion in semi-infinite plates of hydrogen in metals containing trapping sites Original Research Article

Finite difference methods have been used to calculate penetration profiles for the transient diffusion of interstitial (H) atoms from a surface of constant solute concentrations into solid films. The solid contains trapping sites which modify the transient diffusion behavior. Dislocation-related sites of fixed concentration and vacancy-related sites, whose concentration is dependent on temperature, have been considered. Numerical evaluations using input parameters for the Al–H system have been carried out.