About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
Revisiting the Al-Si phase diagram upon a broad range of cooling rates |
| Author(s) |
Indrajeet Katti, Dong Qiu, Duyao Zhang, Matthias Weiss, Joy Forsmark, Mark A. Easton |
| On-Site Speaker (Planned) |
Mark A. Easton |
| Abstract Scope |
The cooling rate in metal additive manufacturing (AM) ranges from 103~106 K/s compared to 10-1~101 K/s in sand castings. The higher cooling rate means the solidification is farther away from equilibrium; therefore, it poses a great challenge to predict the phase constituents in the final microstructure. An Al-10Si model alloy was fabricated using high-pressure die casting (HPDC) and powder bed fusion-laser beam (PBF-LB). Single-track surface remelting experiments were conducted on the PBF-LB alloy to estimate the solidification growth velocity and the growth velocity-dependent partition coefficient. Based on detailed microstructure and the Scheil-Gulliver analysis, a series of empirical relationships were developed and an ‘effective Al-Si phase diagram’ is proposed. High cooling rate in the order of 106 K/s resulted in approximately 400 K undercooling that substantially increased the eutectic composition to 64 wt.% from 12.6 wt.% (equilibrium). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Solidification |