Tritium radioluminography was used to determine hydrogen diffusion coefficients in Ti50Cr50 and Ti40Cr40 alloys, both with two-phase structures of a body-centered cubic phase and a Laves phase. Using radioluminography, H distributions in those phases were observed, and H penetration profiles were measured. The tritium diffusion coefficients in the Ti50Cr50 and Ti40Cr60 alloys were successfully determined by analyzing the tritium penetration profiles to be 3.3 x 10-12 and 1.41 x 10-12m2/s, respectively. These values suggest that the H diffusion in the Laves phase is slower than that in the bcc phase. It is also suggested that H diffuses by short-circuiting diffusion through the interface between the bcc phase and the Laves phase.

Application of Tritium Radioluminography to the Detection of Hydrogen Diffusion in Ti-Cr Alloy. H.Saitoh,H.Homma: Journal of Phase Equilibria and Diffusion, 2005, 26[5], 516-9. See also: Materials Science Forum, 2005, 475-479[III], 2513-6