Evolution of Interfacial Structure and Stress Induced by Interfacial Lattice Mismatch in Layered Metallic Nanocomposites

Abstract

The interfacial structure directly affects the intrinsic residual stress caused by the interfacial lattice mismatch in layered metallic composites. This stress plays a dominant role in the mechanical, optical, magnetic, and thermal properties of nanocomposites. Here, the interfacial structure evolution and atomistic origin of intrinsic residual stress are figured out through the in situ characterization of atom arrangement and rearrangement in layered metallic nanocomposites with different interfacial misfit by using an atomistic approach. It is found that with the increment of the interfacial misfit, the interface roughens while the intrinsic residual stress increases and then reduces. The film structure dominates the evolution of interfacial structure and intrinsic residual stress when the interfacial misfit is low, whereas the effect of substrate structure on the interface and the stress is as important as the film structure with the increase of the interfacial misfit. The work demonstrates how the film structures affect the interfacial structure and intrinsic stress in layered metallic nanocomposites. Both the film and substrate structures should be taken into consideration to design layered composites with excellent properties.

Nanoengineering in biomedicine: Current development and future perspectives

“…Due to the ordered structure with specific lattice spacing in metallic materials, the interfacial properties between two adjoining phases are affected by lattice mismatch, which can be well characterized by nanoengineering. The effect of film structure on interfacial structure and intrinsic residual stress caused by interfacial lattice mismatch in layered metallic composites is figured out using MD simulations, and the atomistic origin of atom arrangement is pointed out for the consideration of composite design with desired properties [26]. In addition, protein and other biomolecules usually tend to adsorb on the surface of inorganic materials.…”