| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
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Progress towards Understanding the Synthesis and Behavior of Metals Far from Equilibrium: A SMD Symposium Honoring Enrique Lavernia on the Occasion of His 60th Birthday
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| Presentation Title |
Experimental Observations of CALPHAD Predicted Phases in High-entropy Alloys |
| Author(s) |
Reza Abbaschian, Nicholas A. Derimow, Benjamin MacDonald, Enrique J. Lavernia |
| On-Site Speaker (Planned) |
Reza Abbaschian |
| Abstract Scope |
We present the latest experimental observations and CALPHAD predictions of phase formation in AlCrFeNiMo0.3, CoCrCuNi, and CoCrCuMnxTi high-entropy alloys (HEAs). Thermo-Calc predictions for these alloys were made using the TCHEA3 database, while the experimental observations consisted of microstructural analysis from arc-melting, electromagnetic levitation melting, and neutron imaging experiments. The latter was utilized for in-situ imaging of liquid phase separation in CoCrCu, and remixing into a single liquid with the addition of Ni to form molten CoCrCuNi. These observations as well as formation of face-centered cubic phases were in agreement with those predicted. Similarly, for the CoCrCuMnxTi alloys, calculations predicted the presence of the experimentally observed hexagonal Laves C14 phase as well as the Cu-rich FCC interdendritic phase. On the other hand, arc-melting of AlCrFeNiMo0.3 showed the presence of a stable liquid miscibility gap, while calculations predicted a liquid miscibility gap at very large supercoolings. |
| Proceedings Inclusion? |
Undecided |