The activity of Cu in the α phase was investigated, by means of interdiffusion techniques, at 1158 to 1273K. It was found that the results could be described by:

D (m2/s) = 1 x 10-4exp[-275(kJ/mol)/RT]

M.Arita, M.Nakamura, K.S.Goto, Y.Ichinose: Transactions of the Japan Institute of Metals, 1984, 25[10], 703-9