About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
Stabilization of ordered phases in a Al0.3CoFeNi High Entropy Alloy Leading to Excellent Tensile Properties: Entropy versus Enthalpy |
| Author(s) |
Nachiket Keskar, Sudip Kumar Sarkar, Abhishek Sharma, Tirthesh Ingale, Advika Chesetti, Sriswaroop Dasari, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Nachiket Keskar |
| Abstract Scope |
This study investigates the Al₀.₃CoFeNi high entropy alloy, focusing on its temperature-dependent phase evolution and resulting mechanical properties. A high-temperature single-phase FCC structure decomposes first into an ordered B2 phase and then into a B2 + L1₂ mixture at lower temperatures. This decomposition pathway highlights the interplay between the high entropy of the B2 phase at 700 °C—evident in its complex site occupancies—and the formation of B2 and L1₂ phases with simpler occupancies at 600 °C. The final microstructure, containing high fractions of B2 and L1₂ along with some retained FCC, delivers excellent mechanical performance, including ~1500 MPa yield stress, >1650 MPa tensile strength, and 12–13% ductility. Despite the degree of ordering, both B2 and L1₂ phases retain significant deformability, as seen in the deformed microstructures. The evolution of magnetic properties with changing phase composition is also discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Entropy Alloys, Mechanical Properties |