The migration of T in Al-1.1wt%Li alloy was investigated by using a radiochemical method. It was found that most of the T which was incorporated into the material existed in the T- state, and was released in the form of HT when the material was heated in vacuum. The T diffusivities which were deduced from HT release measurements could be described by:

D (cm2/s) = 7.9 x 10-2 exp[-17.2(kcal/mol)/RT]

The diffusivities were orders of magnitude lower than those for Li in Al. This was attributed to a trapping effect which was associated with the Li atoms in the material.

T.Hayashi, K.Okuno, H.Kudo, H.Amano: Journal of the Less-Common Metals, 1988, 141[1], 169-76