About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
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| Symposium
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Interstitial–Metal Interactions: The Outsized Role of Small Atoms
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| Presentation Title |
Interstitial effects on temperature-dependent critical stress and dislocation glide of screw and edge dislocations in tantalum |
| Author(s) |
Pulkit Garg, Amy J. Clarke, Irene J. Beyerlein |
| On-Site Speaker (Planned) |
Pulkit Garg |
| Abstract Scope |
Interstitials strongly influence mechanical behavior of body-centered cubic (bcc) metals, yet their interactions with dislocations at finite temperatures remain partly understood. Here, we develop a phase-field dislocation dynamics (PFDD) framework coupled with Langevin dynamics for both dislocations and interstitials to investigate temperature-dependent interactions between oxygen (O) interstitials and dislocations in bcc tantalum (Ta). PFDD simulations reveal thermally fluctuating, but spatially confined, interstitial atmospheres around both screw and edge dislocations. Increasing temperature redistributes interstitials, modifying local concentration without eliminating solute binding to the core. Quantifying the stress required for dislocation motion shows that O increases dislocation glide resistance across all temperatures studied, with the strengthening effect more pronounced for edge dislocations than for screw dislocations, while thermal fluctuations progressively reduce strengthening for both dislocation types. Overall, this work provides a mesoscale, temperature-dependent description of interstitial-dislocation interactions and establishes a predictive framework linking solute chemistry, temperature, and mechanical response in bcc metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Modeling and Simulation |