Diffusion in this system was investigated at 1323 to 1523K via determination of the interdiffusion coefficients. The main interdiffusion coefficients of the system were larger than the cross-interdiffusion coefficients; indicating that the influence of the concentration gradients of the elements generally still predominated. It was clear that the presence of Co reduced Re diffusivity in Ni. The results thus revealed that an attractive force existed between Co and Re, and that the interatomic bonding of Co-Re seemed to be stronger than that of Ni-Re. The interdiffusion coefficients could be described by the Arrhenius expressions:

DCoCoNi(m2/s) = 1.36 x 10-4exp[-285.49(kJ/mol)/RT]

DReReNi(m2/s) = 1.05 x 10-3exp[-343.18(kJ/mol)/RT]

DCoReNi(m2/s) = 9.92 x 10-3exp[-374.01(kJ/mol)/RT]

DReCoNi(m2/s) = 1.38 x 10-5exp[-301.17(kJ/mol)/RT]

E.Mabruri, S.Sakurai, Y.Murata, T.Koyama, M.Morinaga: Materials Transactions, 2007, 48[10], 2718-23