|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Non-equilibrium Features of Grain Boundaries
||CSL Pinning Mechanism Associated with Non-thermally Activated Mobility in Sigma 7 and Sigma 9 Grain Boundaries
||Jake Bair, Eric Homer
|On-Site Speaker (Planned)
Grain boundary (GB) migration in 7 and 9 grain boundaries are simulated at temperatures from 100 K to 1000 K under various synthetic driving forces using Molecular Dynamics. The set of boundaries span the range of possible boundary planes for the two misorientations. The simulations are analyzed using slip vectors and microrotations to determine the mechanisms leading to the different mobility trends with respect to temperature. Atoms occupying CSL sites are identified as the cause of a GB pinning effect which is directly linked to antithermal behavior. All GBs exhibiting antithermal behavior have extremely ordered motion at low temperatures, which becomes exponentially more disordered at higher temperatures in the antithermal temperature range. The combined effects of CSL pinning and ordered atomic motion leading to antithermal GB mobilities are discussed.
||Planned: Supplemental Proceedings volume