Incremental diffusion couple experiments were conducted in order to determine the average interdiffusion coefficient and the intrinsic diffusion coefficients of species in the Ni6Nb7 (μ phase) of the Ni-Nb system. Furthermore, the tracer diffusion coefficients were calculated from a knowledge of thermodynamic parameters. The diffusion rate of Ni was found to be higher than that of Nb, which indicates higher defect concentration in the Ni sub-lattice.

Diffusion and Growth of the μ Phase (Ni6Nb7) in the Ni-Nb System. S.S.K.Balam, H.Q.Dong, T.Laurila, V.Vuorinen, A.Paul: Metallurgical and Materials Transactions A, 2011, 42[7], 1727-31