About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Circular Metallurgy: Design, Technology, Application
|
| Presentation Title |
Solidification Pathways in Al-Fe Alloys under Different Cooling Rates |
| Author(s) |
Ying Yang, Sunyong Kwon, Kyaw Hla Saing Chak, Yijia Gu, Ke An, Sumit Bahl, Amit Shyam, Alex Plotkowski, Allen Haynes |
| On-Site Speaker (Planned) |
Ying Yang |
| Abstract Scope |
Fe is the most common impurity in recycled aluminum and is difficult to remove from the melt. It forms brittle intermetallic phases during solidification, limiting how much scrap can be used in structural castings. A practical alternative to Fe removal is controlling which intermetallic phases form. This is not straightforward, because as-cast microstructures of near-eutectic Al-Fe alloys often contain primary phases and metastable constituents that equilibrium and Scheil–Gulliver calculations fail to predict. We describe a modified Scheil–Gulliver model (NucleoScheil) that assigns a critical nucleation undercooling to each solid phase. This single addition captures both metastable phase selection and primary-phase formation inside eutectic regions, correctly predicting the primary FCC-Al observed in conventionally cast hypereutectic Al–2.5Fe (wt.%) alloy. We are testing the model against wedge castings spanning a wide range of cooling rates, using neutron diffraction for bulk phase fractions and electron microscopy for intermetallic morphology and distribution |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Aluminum, Recycling and Secondary Recovery, Solidification |