|About this Abstract
|MS&T21: Materials Science & Technology
|Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
|Irradiation-induced Self-organization of the Microstructure in Irradiated Alloys and Its Influence on Mechanical Properties
|Pascal M. Bellon, Qun Li, Gabriel Bouobda Moladje, Sung-Eun Kim, Soumyajit Jana, Robert S. Averback
|On-Site Speaker (Planned)
|Pascal M. Bellon
Irradiation can induce the self-organization of phase-separating alloy systems into nanoscale compositional patterns (CP) owing to the competition between finite-range ballistic mixing with thermodynamically-driven decomposition. Here we extend the study to CP at grain boundaries (GBs), and consider its impact on mechanical properties. We propose phase-field models to investigate this coupled self-organization in phase-separating A-B alloys. In a first model, a multi-order parameter phase-field model is augmented by adding a finite-range gaussian ballistic mixing contribution. A second model considers GBs as arrays of dislocations, providing a more detailed information on solute segregation and precipitation at specific sites of the GBs. These models make it possible to identify irradiation conditions promoting coupled CP, thus simultaneously inside grains and at GBs. We compare these predictions to experimental results of precipitate evolutions in Al-Sc and Al-Sb, and assess the impact of solute re-distribution and precipitation on the hardness of these materials.