|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Non-equilibrium Features of Grain Boundaries
||Dislocations, Twins, Grain Boundaries and their Interactions in HCP Rhenium
||Julian E.C. Sabisch, Lu Jiang, Liang Qi, Joshua P. Kacher, Andrew M. Minor, Daryl C. Chrzan, Mark Asta
|On-Site Speaker (Planned)
The mechanical properties of hexagonal-close-packed (hcp) rhenium (Re) are characterized by a combination of high-temperature strength, low temperature ductility, and high work hardening. This talk will present recent insights into the mechanisms underlying these properties, derived through experimental measurements based on TEM and EBSD characterization of deformation microstructures, as well as in-situ TEM deformation studies, augmented by theoretical modeling. The mechanical behavior of hcp Re is shown to be derived from a complex interplay of dislocation and twinning mechanisms. We describe the observed nature of twin-twin, dislocation-twin and twin-grain boundary interactions that underlie the high work hardening rate and discuss how these interactions are related to nature and energetics of the dominant twin system active in this system. This work is supported by the Office of Naval Research under Grant N00014-16-1-3124.
||Planned: Supplemental Proceedings volume