Diffusion of Alummum in β-Titanium

Interdiffusion coefficient (D) over right arrow in the beta phase of T-1 Al alloys has been determined by Matano s method in the temperature range 1323 to 1823K with (pure T-1) (T-1 8 5 at% Al alloy) (pure T-1) (T-1 165 at% Al alloy) and (T-1 8 5 at% Al alloy) (T-1 16 5 at% Al alloy) couples In the whole temperature range the value of 15 increases gradually with increasing aluminum content The Arrhenius plot of (D) over right arrow up to 6 at% Al shows an upward curvature similar to that recognized in the self diffusion in beta T-1 The curvature becomes small with increasing aluminum content and it is nearly linear in the concentration more than 10 at% Al The activation energies for the impurity diffusion in beta T-1 are proportional to the squire of radius of the diffusing atom This suggests that the size effect is dominant in the impurity diffusion in beta T-1 [doi 10 2320/matertrans M2010225].