鉄中の水素と重水素の拡散における転位のトラップ効果

抄録

The diffusion of hydrogen and deuterium in commercially pure iron specimens variously deformed and annealed has been investigated between 283 K and 318 K by an electrochemical permeation method. The temperature dependence of the diffusion coefficients of hydrogen (D_H) and deuterium (D_D) is discussed on the basis of the trapping theory. The ratio D_H/D_D is temperature dependent, but the dependence of the ratio upon dislocation density is not found. This indicates that the trap density and binding energy are, within experimental error, the same for hydrogen and deuterium, and the activation energy of diffusion in normal lattice sites is mass dependent. The binding energies with trapping sites (dislocations) for both hydrogen and deuterium in iron are about 27 kJ/mol.