|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Quantification of Dislocation Behavior and Deformation Twinning at High Strain Rates
||Mitra L Taheri, Shang-Hao Huang, Evan Kahl, Asher Leff, Christopher Barr, Logan Shanahan, JP Liu, Yong Zhang, Leslie Lamberson
|On-Site Speaker (Planned)
||Mitra L Taheri
The mechanism of and transition between slip and twinning is well-studied at “conventional” strain rates. At high strain rates, however, dislocation nucleation occurs more readily and it is not clear how these increased nucleation phenomena alter the development of twinned microstructures. While a wealth of information is available for high strain rate deformation of FCC, HCP, and some BCC materials, specific details regarding dislocation substructures and their association with slip to twin transitions are not clear. This presentation will highlight experiments, using correlated Kolsky and multiscale microscopy techniques, that attempt to pinpoint the transition between slip and twinning at high strain rates in stainless steels and high entropy alloys. The transition will be discussed as a function of the nucleation, density, and propagation of dislocations (and dislocation substructures), and microstructural features such as orientation, chemistry, and stacking fault energy.