|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Taylor Impact Tests of Single- and Polycrystalline Tantalum
||Hojun Lim, Jay Carroll, Corbett Battaile, Hyuk Jong Bong, Shuh-Rong Chen, Matthew Lane
|On-Site Speaker (Planned)
Most metallic materials are aggregates of highly anisotropic single crystals. In this work, Taylor impact tests are conducted using single crystal tantalum specimens oriented along various directions and polycrystals to understand their dynamic behaviors and plastic anisotropy. It is shown that the single crystals exhibit severe plastic anisotropy upon impact compared to polycrystalline tantalum. Deformed shapes of single crystals show good agreement with the crystallographic analysis. In addition, the texture of polycrystalline tantalum is obtained by electron backscatter diffraction (EBSD) technique and used as an input for crystal plasticity-finite element (CP-FE) simulations. Continuum scale anisotropic yield criteria is parameterized to CP-FE results and Taylor impact test of polycrystalline tantalum is modeled. The prediction agrees well with the experimental observation, in particular, anisotropic behavior. This approach provides a direct link between grain scale microstructural features and anisotropic mechanical behaviors of single and polycrystalline metals at dynamic regimes.
||Planned: Supplemental Proceedings volume