Structure of Interfaces in Cu$|$Au Nanolaminates

We used molecular dynamics calculations to study the influence of interdiffusion on the bicrystal interface of Cu$|$Au nanolaminates. Starting from an ideal bicrystal of 50 nm thickness with a $\{111\}$ semi-coherent interface, we created a diffusive interface region and annealed the system at 1000 K. We report the resulting interfacial crystallographic defects as a function of interface width. Our results show an increase of dislocation spacing as the interface becomes more diffuse. The most diffuse interfaces of $\sim$ 10 nm width studied here form stacking fault tetrahedra.