| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
The Thermodynamics of Mechanical Behavior in BCC Refractory Compositionally Complex Alloys |
| Author(s) |
Eric A. Lass |
| On-Site Speaker (Planned) |
Eric A. Lass |
| Abstract Scope |
Refractory-based compositionally complex alloys (R-CCAs) have been extensively studied over the last decade as potential next generation high temperature materials. Despite the promising elevated temperature strength retention observed in some systems, most R-CCAs suffer from a lack of ductility at room temperature, a result of the ductile-to-brittle transition exhibit by body-centered cubic (BCC) alloys. Further, edge-dislocation dominated plastic deformation is often observed in BCC R-CCAs at room temperature, in direct contrast with conventional BCC alloys where screw-dislocations control plastic deformation. This work examines deformation behavior in BCC R-CCAs from a thermodynamic perspective, where the stability of the BCC crystal structure relative to competing phases is hypothesized to be related to dislocation mobility, strength, and ductility, akin to the relationship between stacking fault energy and the free energy difference between FCC and HCP in close-packed alloys. Use of this theory as a design tool for predicting ductile R-CCAs is demonstrated. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |