Powder samples of supersaturated solid solution, Al-7.8Ti-0.3at%Fe, having a nanocrystalline structure were prepared by mechanical alloying. The powder was compacted into a columnar form, at low temperatures. The diffusion of Cu in the compacted nanocrystalline material was studied by means of ion mass microanalysis. The results could be described by:

D(cm2/s) = 2.4 x 10-8exp[-34.8(kJ/mol)/RT]

It was noted that the interfacial diffusion coefficient of Cu in the nanocrystalline materials was higher than the volume diffusion coefficient of Cu in Al.

Y.Minamino, S.Saji, K.Hirao, K.Ogawa, H.Araki, Y.Miyamoto, T.Yamane: Materials Transactions, 1996, 37[2], 130-7