|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Grain Boundary Segregation in Binary Alloys: A Diffuse Interface Model
||Fadi Abdeljawad, Stephen M. Foiles, Brad Boyce, Khalid Hattar, Blythe G. Clark
|On-Site Speaker (Planned)
Segregation of elemental species/impurities to grain boundaries (GBs) strongly influences a wide range of materials processes. In nanocrystalline (NC) alloys, GB segregation has been proposed as a route to thermally stabilize the grain structure of such systems. Herein, based on a diffuse interface model that accounts for both bulk and GB thermodynamics, solute-GB interactions, and GB migration, we present quantitative analysis of GB segregation and its impact on grain growth dynamics. First, analytical treatments are presented, which establish regimes where the reduction in GB energy can be large. Then we turn our attention to immiscible NC alloys, where the interplay between GB segregation and bulk precipitation determines the extent of solute partitioning between the grains and GBs, affecting the overall thermal stability of these systems. Finally, we highlight several features and limitations of the modeling framework and discuss further extensions aimed at incorporating microstructural anisotropy into the segregation behavior.
||Planned: Supplemental Proceedings volume