Effect of H-H Interaction on the Flux, Self-stress and Concentration Distribution of Hydrogen in fcc Membranes during Steady Diffusion

摘要

Based on the thermodynamics involving the lattice expansion due to hydrogen insertion, the interaction between hydrogen atoms and the blocking effect in diffusion, we discuss the profiles of hydrogen concentration and self-induced stress in the steady-state during hydrogen diffusion across elastic membranes of fcc metals or alloys. Contrary to the conventional viewpoint, it is found that the self-induced stress suppresses the deviation of the concentration distribution from the linearity. The diffusion flux is independent on the existence and amplitude of self-stress; this indicates that the determination of diffusion coefficient in terms of the steady-state flux across a membrane can be used experimentally even while the self-stress effect is significant.