The diffusivity of H in this intermetallic compound was measured at temperatures ranging from 973 to 1323K (figure 8) by using gas absorption methods. It was found that the activation energy for diffusion was almost twice that for pure Ti or Al. It was suggested that the cause of this large activation energy was the presence of ordered Al atoms in Ti3Al, and a difference in the heat of solution of H between Ti and Al.

S.Naito, O.Hashitomi, M.Yamamoto, Y.Baba, M.Kimura: Journal of the Chemical Society - Faraday Transactions, 1994, 90[16], 2423-4