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 |
Discerning Chemical Short-range Ordering from Nanoindentation Pop-in Loads in a BCC Refractory Complex Concentrated Alloy |
Author(s) |
Jonathan Cappola, Glenn H. Balbus, Todd M. Butler, Lin Li |
On-Site Speaker (Planned) |
Jonathan Cappola |
Abstract Scope |
This study investigates the impact of local chemical short-range ordering (CSRO) on initial nanoindentation pop-in loads of a BCC refractory complex concentrated alloy, MoNbTa, using atomistic simulations and experimental techniques. Atomistic samples of MoNbTa exhibiting CSRO are generated through Monte Carlo atom swapping in conjunction with molecular dynamics (MD). Nanoindentation tests are performed on the atomistic samples and the resulting distributions of pop-in loads are examined. The findings reveal a positive correlation between the presence of CSRO and the average pop-in load, indicating CSRO influences heterogeneous dislocation nucleation. To delve deeper, MD simulations explore the early stages of nucleation in presence of various CSROs. Nanoindentation experiments were performed on arc melted and homogenized MoNbTa subject to several heat treatments designed to promote various degrees of CSRO. The nanoindentation pop-in results of these samples are compared with the simulation trend to discern the impact of local ordering on the mechanical responses. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Modeling and Simulation, Mechanical Properties |