| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Martensitic Phase Transformation and Anomalous Hardening in CrMnFeCoNi High-Entropy Alloy |
| Author(s) |
Robert Chulist, Aurimas Pukenas, Anton Hohenwarter, Reinhard Pippan, Werner Skrotzki |
| On-Site Speaker (Planned) |
Werner Skrotzki |
| Abstract Scope |
Under hydrostatic pressure the CrMnFeCoNi high-entropy alloy (HEA) undergoes a phase transformation from fcc to hcp. The onset pressure is strongly reduced by high pressure torsion (HPT): shear stress promotes partial dislocation slip. HPT of the low stacking fault energy HEA leads to a nanocrystalline (nc) microstructure. The hardness anomaly is due to the extreme nc microstructure with grain boundary/interphase boundary sliding as dominating deformation mechanism: inverse Hall-Petch regime, where hardness increases with increasing grain size. In submicrocrystalline materials conventional Hall-Petch hardening is dominating, i.e. hardness decreases with increasing grain size. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Mechanical Properties |