About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing: Advanced Characterization With Synchrotron, Neutron, and In Situ Laboratory-scale Techniques IV
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| Presentation Title |
Harnessing Intermediate Metastable Phase Formations to Engineer Alloy microstructures in Additive Manufacturing |
| Author(s) |
Mahya Azizi, Kaushlendra Singh, Akane Wakai, Chenxi Tian, Sai Pratyush Akula, Amlan Das, Kate Shanks, Atieh Moridi |
| On-Site Speaker (Planned) |
Atieh Moridi |
| Abstract Scope |
Additive manufacturing (AM) enables precise control over alloy microstructures by tailoring compositions and processing parameters. Traditionally, higher cooling rates are associated with finer microstructures, while slower cooling rates tend to produce coarser grains. However, this work challenges that paradigm by investigating microstructural evolution across different alloy systems. We examine how cooling rates interact with other critical factors, such as composition, the formation of intermediate phases, and solid-state phase transformations to influence the final microstructure. Using a combination of operando synchrotron X-ray diffraction, CALPHAD-based simulations of solidification pathways, and multi-scale post-process microstructural analysis, we demonstrate that adjusting alloy composition and employing lower cooling rates can promote the stabilization of intermediate phases at elevated temperatures. These phases subsequently transform into refined microstructures upon further cooling. This phenomenon was observed in both PH17-4 stainless steel and FeMnCoCr multi-principal element alloys, where distinct phase transformations led to grain refinement, challenging conventional solidification theory. |
| Proceedings Inclusion? |
Planned: |