A model for diffusion was applied to the Ni–Al system in order to optimize the mobility parameters for the B2-body-centred cubic phase by fitting the experimentally obtained diffusivities. In the model, the activation energy for diffusion was expressed as a function of the degree of ordering which was evaluated from thermodynamic data. The diffusivities from the model were used to simulate diffusion experiments. The results were compared with experimental data and it was concluded that the model could yield satisfactory predictions.

Diffusion Mobilities for the B2-BCC Phase in the Ni–Al Binary System. H.Wei, G.Hou, X.Sun, H.Guan, Z.Hu: Journal of Alloys and Compounds, 2008, 454[1-2], 400-5