Diffusivity of Ni in an amorphous Ni-Zr alloy

The Ni diffusivity and composition profile were measured in an amorphous Ni-Zr alloy formed in a Ni/a-NiZr/Zr binary diffusion couple. The Ni diffusion coefficient at 250 °C was found to be 1×${10}^{\mathrm{-}16}$ ${\mathrm{cm}}^2$/sec. The concentration profile within this amorphous phase is linear and the compositions at the interfaces between the amorphous alloy and the pure Ni and pure Zr tend to the constant values of 68% Ni and 47% Ni, respectively.