It was found that the data for a 2at%Cu alloy at 750 to 800C could be described by:

D (cm2/s) = 5.2 x 10-1 exp[-43.9(kcal/g-atom)/kT]

J.R.Cahoon, W.V.Youdelis: Transactions of the Metallurgical Society of AIME, 1967, 239, 127-9