About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
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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 the equilibrium state; therefore, it poses a great challenge to predict the phase constituents in the final microstructure. In this study, an Al-10Si model alloy was fabricated using high-pressure die casting (HPDC) and powder bed fusion-laser beam (PBF-LB) processes. 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. Furthermore, all alloys were heat treated at 200°C for 4 hours to estimate Si solubility in the α-Al matrix. 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. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, Solidification |