Dislocation-Based Deformation Mechanisms in Metallic Nanolaminates: An Experimental and Theoretical Study

Ohio State University Research Foundation -Do Not Use, Columbus OH

Investigators

Abstract

0072010 Anderson This effort involves a close research interaction between dislocation mechanics modeling and novel processing and transmission electron microscrope experiments that will lead to a fundamental understanding of deformation mechanisms in layered nanomaterials. A principal goal of this research is to understand the limiting strength of such materials to plastic deformation, as the thickness of individual layers in the structure are decreased to the nanometer scale. To do so, the investigators will observe directly the generation, motion, and interaction of dislocations in layered nanomaterials over a range of individual layer thickness. Particular attention will be given to the critical conditions for which interfaces are no longer able to confine dislocation motion to individual layers. These observations will couple closely with theoretical treatments of the nucleation and motion of dislocations in confined layer geometries, and the critical stress to transmit slip across grain boundaries and interfaces. This research will extend our knowledge of how to develop ultra-high strength two-phase layered nanomaterials through the choice of phases, the scale at which they are employed, and the structure of the interfaces and grain boundaries which serve to confine dislocation motion. ***