About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
Temperature-dependent Deformation Mechanisms in Single-crystalline RMPEAs |
| Author(s) |
Daniel Magnuson, Pulkit Garg, Mo-Rigen He, Irene Beyerlein, Kevin Hemker |
| On-Site Speaker (Planned) |
Daniel Magnuson |
| Abstract Scope |
Studies of RT dislocation motion in BCC RMPEAs have evidenced increased activation of higher order slip systems and a multiplicity of slip—a fundamental departure from the dislocation motion in BCC metals and dilute alloys. Single-phase ternary RMPEAs are used as model systems for investigating these novel deformation mechanisms. In this study, the first single crystals of MoNbTi were grown and tested in tension at temperatures exceeding 1,000oC. Post-mortem slip-trace analysis and TEM characterization of deformed specimens, combined with phase field dislocation dynamics (PFDD) simulations, allowed us to confirm the multiplicity of slip at these extreme temperatures and to elucidate the dislocation processes that underpin ultrahigh temperature plasticity in these alloys. Comparisons of edge verse screw mobility, the importance of kink nucleation and the roles of cross kinks are all under investigation and can be used to benchmark dislocation-based models of RMPEA plasticity. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Other |