|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Intrinsic Scale Effects in Metal Deformation
||Christopher F. Woodward, Satish I Rao, Ahmed Hussein, Brahim Akdim, Edwin Antillon, Triplicane Parthasarathy
|On-Site Speaker (Planned)
||Christopher F. Woodward
Changes in deformation behavior for macro-nano scale samples can be used to inform size dependent plasticity methods. Such scale effects are quantified and validated using lower scale, physics-based models. Experiments show strong size effects in metal micro-pillars with dimensions below ~50 micron. This size dependent behavior is consistent with deformation occurring below a characteristic dislocation correlation length. Micro-scale dislocation evolution simulations exhibit the same behavior and reveal the mechanistic source of strengthening at these scales. In this work, large scale atomistic and dislocation dynamics simulations are used to assess the aspects of ensemble hardening in simple metals. The work hardening rates of micro pillars, uniaxial loaded along <100>, <110>, and <111>, are calculated using dislocation dynamics simulations. Simulations include dislocation intersection cross slip which enhances the rapid increase in dislocation density. Analyses of the evolving dislocation ensembles, including the formation of strong dislocation heterogeneities are reviewed.