Interdiffusion and Atomic Mobilities Studies in Ni-Rich fcc Ni-Ti-V Alloys

The diffusion couples of Ni-Ti-V ternary alloys prepared and annealed at 1373 and 1473 K have been measured by electronic-probe microanalysis. Based on the concentration profiles, the interdiffusion coefficients were determined by using the Whittle and Green method. The atomic mobilities of the Ni-Ti-V ternary alloys were assessed based on the interdiffusion coefficients reported in the literature and the data obtained from the present work. In the comprehensive comparison, it was found that the model-predicted diffusion properties were in good agreement with the experimental data, which indicated that the diffusion phenomena such as diffusion paths and concentration profiles in the Ni-Ti-V ternary system can be reasonably described by the obtained atomic mobilities. This work contributes to the establishment of nickel-based kinetic database.