About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
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| Presentation Title |
Unraveling High-Temperature Strengthening Mechanisms in Chemically Complex Alloys through Multiscale Dislocation Dynamics Simulations |
| Author(s) |
Morgan Jones, Pulkit Garg, Irene Beyerlein |
| On-Site Speaker (Planned) |
Morgan Jones |
| Abstract Scope |
Refractory multi-principal element alloys (RMPEAs) combine a chemically disordered lattice with a structurally ordered body-centered cubic crystal structure. Their vast compositional flexibility offers new opportunities for developing next-generation structural materials that retain high strength at elevated temperatures. The mechanical behavior of RMPEAs is governed in part by the nature of dislocation motion in chemically complex environments. Accelerating the discovery of compositions capable of withstanding extreme conditions requires predictive, dislocation-level models that bridge atomic-scale mechanisms with macroscopic performance. In this work, we use a three-dimensional, atomistically informed phase field dislocation dynamics model to systematically identify the rate-controlling dislocation glide mechanisms in a family of MoNbTa-based RMPEAs. We identify key statistical features of the energy landscape that drive variations in glide behavior and transition temperatures. These findings highlight the critical role of chemical fluctuations in shaping dislocation-mediated plasticity in RMPEAs and provide design insight for structural alloys intended for high-temperature applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Computational Materials Science & Engineering, Modeling and Simulation |