| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
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| Presentation Title |
Mechanistic Transitions Governing Strength and Stability in Grain Boundary Segregation Strengthened Nanocrystalline Aluminum Alloys |
| Author(s) |
Jason Trelewicz |
| On-Site Speaker (Planned) |
Jason Trelewicz |
| Abstract Scope |
High specific strength materials are critical for enhancing performance in a broad range of applications such as next generation aerostructures and hypersonic vehicles. In this talk, we present molecular dynamics simulations in the Al-Mg system that quantify the mechanisms responsible for strengthening in the presence of grain boundary doping. At low strains, microplasticity is shown to be suppressed by solute enrichment producing more stable interfacial configurations, which delays the onset of grain boundary-mediated dislocation slip. Following the yield point, the interaction of dislocations with grain boundary solute reduces the strain accommodated through dislocation plasticity, thus shifting plastic strain accommodation to the grain boundaries. Finally, an experimental campaign with the goal of producing these high strength alloys is described, where a new reactive phase sintering mechanism is shown to produce oxide dispersion strengthened bulk nanocrystalline Al-Mg alloys with a stable mean grain size of ~50 nm up to 500°C. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Mechanical Properties, Modeling and Simulation |