|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-120: Phase Field Dislocation Dynamics Modeling of Refractory High Entropy Alloys
||Lauren Smith, Shuozhi Xu, Yanqing Su, Abigail Hunter, Irene Beyerlein
|On-Site Speaker (Planned)
Refractory multi-principle element alloys show great potential for high-temperature applications, but their deformation mechanisms are not well understood. Since deformation of these materials in mediated by slip, there is a strong motivation to understand dislocation behavior in these alloys. To study this, we develop a phase field dislocation dynamics (PFDD) model. Because screw dislocations are known to dominate behavior in BCC metals, a dislocation character dependence is added to the PFDD model by adjusting the lattice energy, which accounts for the dislocation cores. Additionally, the random chemical variations of the disordered solid solution phase are modelled via a position-dependent lattice energy. This model can be applied to a ternary MoNbTi alloy by incorporating the distribution of DFT-calculated unstable stacking fault energies. The results of this model on the behavior of Frank-Read sources will be presented.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume