Abstract Scope |
In this presentation, we report on the plastic deformation mechanisms in lamellar nanocomposites as a function of decreasing layer thickness. Utilizing Physical Vapor Deposition (PVD), Accumulative Roll-Bonding (ARB), and cast lamellar eutectics, nanolamellar composites with layer thicknesses to just a few nanometers may be investigated. Using these three techniques, the textures, interfacial defect structures, and deformation mechanisms can be systematically investigated. For instance, deformation twinning is observed in the Cu copper phase in Cu-Nb ARB material as opposed to PVD material. Evolution of preferred interfacial structures during processing will be linked to the structure, energetics, and kinetics of a given interface type, and validated via in-situ straining experiments in the TEM. Mechanical properties and behavior will be discussed in terms of the effects of interfacial content on deformation processes at diminishing length scales, and defect/interface interactions at the atomic scale. |