| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Synergistic Grain Boundary Segregation and Nanodispersoid Induced Stabilization of Ultrafine Grained Tungsten Microstructures |
| Author(s) |
Jason Trelewicz |
| On-Site Speaker (Planned) |
Jason Trelewicz |
| Abstract Scope |
Nanocrystalline microstructures are notoriously unstable and suffer from thermal coarsening at low homologous temperatures, even in high melting point materials like tungsten. In this presentation, we describe a synergistic approach for stabilizing fine grained microstructures in tungsten that combines the thermodynamics of grain boundary segregation with kinetically impeding carbide nanodispersoids. Alloy design maps produced from computational thermodynamics modeling in the W-Ti-Cr system are used to guide alloy selection and provide insights into segregation transitions at elevated temperatures. Ternary ultrafine grained tungsten alloys are synthesized through high energy ball milling with powders consolidated into bulk form using direct current sintering. Not only does grain boundary segregation and nanocarbide formation stabilize ultrafine grain microstructures through sintering, but we also show that the materials are thermally stable well above common recrystallization points for tungsten. Finally, we discuss opportunities for these materials to address the extreme conditions anticipated in future fusion devices. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Powder Materials, Modeling and Simulation |