It was found that both the effective charge number, Z*, and the diffusion coefficient decreased upon adding Ti or Cr, but were not much affected by Fe or Mo (tables 180 and 181). A model for H-trapping by substitutional elements, which had previously been introduced in order to account for a decrease in diffusivity due to solute additions, could not explain the decrease in Z* in a straightforward manner. A change in the electronic structure, due to alloying, was suggested to be responsible for the decrease.

H.Nakajima, M.Yoshioka, M.Koiwa: Acta Metallurgica, 1987, 35[11], 2731-6

Table 180

Diffusion of H in V Alloys at 273K

Table 181

Electromigration of H in V Alloys