About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Competing Entropy Versus Enthalpy Driven Stabilization of Ordered Phases in a Al0.3CoFeNi High Entropy Alloy Leading to Excellent Tensile Properties |
| Author(s) |
Nachiket Keskar, Sudip Kumar Sarkar, Sriswaroop Dasari, Tirthesh Ingale, Advika Chesetti, Raju V. Ramanujan, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Rajarshi Banerjee |
| Abstract Scope |
The present study uses the Al0.3CoFeNi model alloy to address the broader question of high temperature entropic stabilization of an FCC solid solution, and its subsequent enthalpy driven decomposition. The temperature dependent decomposition pathway reveals the interplay between the high entropy of the ordered B2 phase at higher temperatures (700°C), manifested as complex multi-component site occupancies, versus the formation of two different ordered phases, B2 and L12, at lower temperatures (600°C), each with relatively simpler site occupancies. Relevant comparisons have been drawn with solution thermodynamic predictions. The combination of a high fraction of these ordered B2 and L12 phases, together with a smaller fraction of the retained FCC solid solution, leads to an excellent combination of mechanical properties with a yield stress approaching 1500 MPa, tensile strength greater than 1650 MPa, and ductility of 12-13%. Deformability of the ordered B2 and L12 phases is manifested in the overall tensile ductility. |
| Proceedings Inclusion? |
Undecided |