The diffusivity of 51Cr in monocrystals was measured at 875 to 1123K by using a radiotracer and serial sectioning technique. It was found that the diffusion coefficient for Cr in α-Ti was some 2 orders of magnitude greater than the self-diffusion coefficient. The diffusion behaviors parallel and perpendicular to the c-axis were described by:

D (cm2/s) = 2.2 x 10-2 exp[-39.4(kcal/mol)/RT]

and

D (cm2/s) = 2.0 x 10-2 exp[-40.3(kcal/mol)/RT]

respectively. The Cr diffusivity parallel to the c-axis of α-Ti was greater than that perpendicular to the axis.

H.Nakajima, K.Ogasawara, S.Yamaguchi, M.Koiwa: Materials Transactions, 1990, 31[4], 249-54