|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Void Nucleation and Growth at Grain Boundaries in Flat and Surface Perturbed Copper Bicrystals
||Elizabeth Victoria Fortin, Matthew Catlett, Jenna Lynch, Eric Loomis, Pedro Peralta
|On-Site Speaker (Planned)
||Elizabeth Victoria Fortin
Analysis of damage and deformation due to spall around grain boundaries (GBs) can provide a basis for connecting micro- to macroscale behavior. The addition of surface perturbations to bicrystal samples can provide insight on how strain localization occurs next to GBs during shock loading and how rippled release waves interact with boundaries to produce spall. Surface perturbed bicrystals were shocked using laser ablation at the Trident laser at Los Alamos National Laboratory, while flat bicrystals were shocked using flyer-plates via gas gun. Samples were cross-sectioned to perform characterization of damage using electron backscattering diffraction (EBSD) and Scanning Electron Microscopy (SEM) to gather information on the characteristics of the GB, with emphasis on how rippled surfaces and material anisotropy affect strain localization and spallation as compared to flat specimens. Initial results show damage localized at the GB and surface perturbations led to heterogeneity of spall damage distribution in the grain bulks.