| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Quantifying and Predicting a "local" Stacking Fault Energy in Multi-principal Element Alloys |
| Author(s) |
Carlyn LaRosa, Maryam Ghazisaeidi |
| On-Site Speaker (Planned) |
Carlyn LaRosa |
| Abstract Scope |
Here, we quantify the effects of composition on energy fluctuations in FCC multi-principal element (MPE) alloys, examine how it relates to nanoscale deformation modes, and present a model which can reliably predict “local” stacking fault energy (SFE) as a function of the local atomic environment based on bond energies. The concept of a generalized SFE is well-suited for pure metals and dilute alloys. However, it is inadequate for quantifying the same phenomena in MPE alloys (e.g. medium- and high entropy alloys), where local compositional fluctuations can cause significant deviations from the average SFE. We apply our model to the binary and ternary subsets of the CrMnFeCoNi alloy. The outputs of our model can be used in strengthening models, with the added benefit of being significantly more cost effective than direct density functional theory (DFT) calculations. We anticipate extending our model to include the effects of local ordering. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |