Multiscale Modeling of Metallic Microstructures: From Dislocations to Plasticity

摘要

The goal of this research program has been to establish a quantitative link between important strengthening mechanisms and the observed stress-strain behavior of complex, metallic aerospace materials via a modeling strategy involving mesoscale dislocation dynamics (DD) simulations and spatial homogenization. In addition, we have sought to understand better the role of cracks and grain boundaries in determining mechanical behavior, and the impact of obstacles on the formation of dislocation substructures. Substantial progress has been made towards these ends by further developing the DD methodology, by elucidating the interactions among dislocations, solute, and extended defects, and by characterizing dislocation patterning resulting from interactions with obstacles. We summarize below the main results obtained under the auspices of this grant.