Simulation of atomic mobilities, interdiffusivities and diffusional evolution in fcc Ni-Cu-Ti alloys

Abstract

As a contribution to establish a general Ni-based mobility database, the atomic mobilities in fcc Ni-Cu-Ti alloys were explored in this work. Diffusion couples were annealed at 1273 K for 150 h, and the interdiffusion coefficients were evaluated at common composition points of diffusion profiles. By combining such interdiffusion coefficients and the available thermodynamic information, the atomic mobilities of Ni, Cu and Ti in fcc Ni-Cu-Ti alloys were assessed as functions of temperature and compositions within the CALPHAD framework. Further verification of the obtained atomic mobilities was conducted by comparing the calculated and measured interdiffusvities, diffusion profiles in diffusion couples and diffusion paths in the Gibbs triangle.