|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Non-equilibrium Features of Grain Boundaries
||Understating the Deformation and Fracture Behaviors of Heterogeneous Lamella Structures
||Caizhi Zhou, Sixie Huang, Rui Yuan
|On-Site Speaker (Planned)
Heterogeneous lamella (HL) structures composed of soft coarse-grain (CG) and hard ultrafine/nano grain layers possess an unprecedented property combination of high strength and good ductility. In this work, we employ both molecular dynamics (MD) and 3D discrete crystal plasticity finite element (CPFE) simulations to explore the deformation and fracture behaviors of HL structures. After quantitative analysis, we found that the relative uniform deformation in CG layer can homogenize the plastic deformation in NC layer and suppress the strain localization and crack nucleation. In addition, the crack propagation rate was reduced in HL structure, and the average stress on grain boundary atoms was much lower than that in pure nanocrystalline materials. When the crack in the nanocrystalline layer approaches to the interface, the heterogeneous microstructure can reduce the stress concentration by emitting dislocations from the interface into the CG/single crystalline layer.
||Planned: Supplemental Proceedings volume