Abstract
The interdiffusion of nickel and zirconium by a solid‐state reaction to form an amorphous NiZr alloy has been followed by transmission electron microscopy. Cross‐sectional examination of NiZr bilayers annealed at 300 °C has shown the formation of amorphous NiZr and the development of large voids in the nickel neighboring the Ni/NiZr interface. Our results indicate that nickel is the dominant diffusing species in the amorphous alloy and that the diffusion requires a defect mechanism. Prolonged annealing at 300 °C results in the formation of a crystalline NiZr phase, which co‐exists with the amorphous alloy.