About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Elucidating the Roles of Chemistry, Compositional Complexity, and Short-range Order in the Dislocation Energetics of Refractory Alloys |
Author(s) |
Wenqing Wang, Flynn Walsh, Robert O Ritchie, Mark Asta |
On-Site Speaker (Planned) |
Wenqing Wang |
Abstract Scope |
In refractory high-entropy alloys, the formation of chemical short-range order has been predicted to narrow the distribution of dislocation core energies with potentially significant effects on bulk deformation. It is, however, unclear if compositionally complex systems display any unique effects, or if these results are universally applicable. To answer this question, this study investigates how system chemistry, compositional complexity, and the presence of various degrees of chemical short-range order affect the distribution of screw dislocation energies in the binary and ternary subsystems of the NbMoTaW alloy. While short-range order negligibly affects average core energies, their distributions are notably narrowed in all systems, primarily depending on chemistry rather than the number of components. Intriguingly, the degree of narrowing observed in a given system appears largely independent of the degree of short-range order, suggesting a constant, experimentally unavoidable effect. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Modeling and Simulation, Mechanical Properties |