| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics and Kinetics of Alloys III
|
| Presentation Title |
Improved understanding of the time-temperature-transformation (TTT) characteristics of the CrMnFeCoNi high-entropy alloy |
| Author(s) |
Easo P. George |
| On-Site Speaker (Planned) |
Easo P. George |
| Abstract Scope |
Even the famous CrMnFeCoNi HEA phase decomposes into multiple phases below 800 °C. Initially large grain size (mm scale) materials, were used to demonstrate this but phase decompositions took long times as nucleation occurred heterogeneously at grain boundaries. To quantify the role of increased nucleation site density, we investigated recrystallized materials with smaller grain sizes (10-100 µm). Phase decomposition occurs much faster at smaller grain sizes allowing for efficient generation of TTT curves. A factor of 10 decrease in the grain size shifts the nose of the TTT curves to approximately one-third shorter time, consistent with the notion that diffusion distances scale as the square root of time. We also accelerated transformation times by investigating off-equiatomic compositions. A simple thermodynamic procedure will be described to compute TTT curves for equiatomic compositions from experimentally measured TTT curves of off-equiatomic alloys and experimental results that validate this process will be presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Entropy Alloys, Phase Transformations |