About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Martensitic islands in the AlCoNiV multicomponent alloy |
| Author(s) |
Raymond Kwesi Nutor |
| On-Site Speaker (Planned) |
Raymond Kwesi Nutor |
| Abstract Scope |
Multicomponent alloys, including medium- and high-entropy alloys (M/HEAs), represent a rapidly emerging class of materials characterized by multi-principal element compositions and exceptional mechanical properties. Among equiatomic single-phase face-centered cubic (FCC) M/HEAs, the CoNiV medium-entropy alloy (MEA) has demonstrated notable mechanical performance, primarily due to its high degree of lattice distortion. Alloying with aluminum promotes the formation of Al-rich BCC-related precipitates, further enhancing mechanical performance. Here, we report a previously unobserved martensitic transformation occurring exclusively within the BCC regions of the AlCoNiV MEA, embedded in an FCC matrix. This localized transformation is attributed to heterogeneous cooling between the two phases. The resulting martensitic islands contribute to increased hardness and strength, while the surrounding FCC matrix maintains ductility. These findings offer new pathways for tuning phase transformations and optimizing mechanical performance in M/HEAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Mechanical Properties |