| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Solute-strengthening in Alloys with Short-range Order |
| Author(s) |
William A. Curtin, Shankha Nag, Xin Liu |
| On-Site Speaker (Planned) |
William A. Curtin |
| Abstract Scope |
The yield strength of high entropy alloys is primarily controlled by solute-dislocation interactions that are dominated by solute misfit volume interactions with the dislocation pressure field. Solute-solute interactions often play a secondary role. We present an extended theory that includes strengthening due to short-range order (SRO). The theory reveals that SRO affects the strengthening of the misfit interactions, in addition to the average strengthening due to destruction of the SRO by slip, and can lead to a reduction in strength. We validate this result in model BCC Mo-Nb-Ta-W alloys by computing the energy barriers for edge dislocations using the NEB method for alloys with controlled levels of SRO, confirming that SRO can increase or decrease the energy barriers and strengthening due to misfit interactions. The misfit strengthening due to SRO depends only on the SRO parameters and so can be assessed without direct knowledge of solute-solute interactions. |
| Proceedings Inclusion? |
Planned: |