|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Grain Boundary Segregation in High Entropy Alloys: Theoretical Development and Mesoscale Simulations
||Fadi Abdeljawad, Milad Taghizadeh, Malek Alkayyali
|On-Site Speaker (Planned)
Owing to their far-from-dilute compositions, high entropy alloys (HEAs) exhibit unique properties that are not typically encountered in conventional alloys. Recent experiments revealed segregation of elemental species to grain boundaries (GBs) in several HEAs. Even minute amounts of alloys at GBs greatly influence boundary dynamics, including GB migration and grain coarsening. Herein, we present a theoretical and computational model of GB segregation in HEAs and its impact on GB migration. The model accounts for bulk thermodynamics and the interaction of various elemental species with GBs, and it captures various mass transport processes. Simulation results reveal a plethora of segregation behaviors, including synergistic co-segregation and induced de-segregation, that are dependent on alloy-alloy interactions within the GB. Our approach provides avenues to employ GB segregation engineering as a strategy to design HEAs with tailored microstructures.
||Planned: Metallurgical and Materials Transactions