About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Order-disorder transitions of the high-entropy Heusler alloys |
| Author(s) |
Rui Feng, Chuan Zhang, Dunji Yu, Yan Chen, Peter K. Liaw, Michael Widom, Ke An |
| On-Site Speaker (Planned) |
Rui Feng |
| Abstract Scope |
Heusler alloys are a class of intermetallic compounds known for their diverse and tunable magnetic, electronic, and structural properties, like FeAl-based Heusler alloys. To surpass the property limits of conventional systems, we design multicomponent FeAl-based Heusler alloys with varied Al and Ti contents using the high-entropy alloy (HEA) concept. Since their structural and functional properties are closely tied to order-disorder transitions, we investigate their temperature-dependent phase transition and site occupancy behavior using in-situ neutron diffraction and first-principles calculations. Our results show that a full set of reversible order-disorder transitions (L2₁ ↔ B2 ↔ A2) were observed upon heating and cooling. Heusler alloys with higher Al and Ti contents exhibit significantly elevated ordering transition temperatures by ~143 °C for L21 ↔ B2 and ~133 °C for B2 ↔ A2. These findings present an approach to control order-disorder transitions for property optimization in Heusler alloys by the HEA concept. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Characterization |