Resolving Interface Interactions in Layered Structures in 3 Dimensions

3D micro-Laue diffraction was used to probe interface interactions in layered structures. Indented Cr/NiAl composite with alternating submicron size Cr and NiAl lamellae was chosen as a model material. Differential aperture microscopy revealed a twin orientation relationship at the interface between the Cr and NiAl lamellae in the as grown state. The indentation-induced alternation of compressive/tensile residual strains in the neighboring Cr and NiAl lamellae was observed. Line broadening analysis found a two orders of magnitude increase of dislocation density in the near-surface zone in the center of the indent.