About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
2025 Undergraduate Student Poster Contest
|
| Presentation Title |
SPU-32: Development of a New CALPHAD Database for the Fe-Ni-P System |
| Author(s) |
Zachary D. C. Miller, Ugochukwu P. Ochieze, Eric J. Payton, Matthew A. Steiner |
| On-Site Speaker (Planned) |
Zachary D. C. Miller |
| Abstract Scope |
Dilute phosphorus alloying additions are known to impact the kinetics and phase equilibria of the Fe-Ni system at Ni-lean compositions typical of meteorites. Comparatively little attention has been paid to the Fe-Ni-P phase equilibria near equiatomic Fe-Ni compositions, where a hard-to-access L10 ordered phase is a potential replacement for rare-earth permanent magnets. As part of an effort to develop processing routes for Fe-Ni-P magnetic materials, this work aims to optimize existing open source CALPHAD databases over the equiatomic range. Improvements include incorporating the L12 (FeNi3) ordered intermetallic phase (missing from previous efforts) and utilizing a more recent Gibbs energy model for the Fe-Ni binary subsystem. Constructed using the PanOptimizer module of CompuTherm’s Pandat software, the resulting database presents re-optimized ternary phase boundaries and incorporates the L12 phase in preparation for forthcoming experimental data at equiatomic and Ni-rich compositions. |