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 |
Phase transformation dynamics during laser additive manufacturing of high-entropy alloys via high-speed synchrotron imaging and diffraction |
| Author(s) |
Lianghua Xiong, Anping Dong, Baode Sun |
| On-Site Speaker (Planned) |
Lianghua Xiong |
| Abstract Scope |
Understanding and controlling non-equilibrium phase transformation dynamics during laser additive manufacturing (LAM) of high-entropy alloys (HEAs) is critical for microstructure design and performance optimization. However, the rapid, non-equilibrium conditions inherent to LAM pose significant challenges for in situ experimental characterization. This presentation addresses this gap by leveraging high-speed synchrotron X-ray imaging and diffraction at leading facilities to probe the transient phase evolution within HEA melt pools of fusion-based LAM processes. First, we will discuss the advancements in instrumentation and methodologies developed at synchrotron sources (e.g., Beijing, Shanghai) enabling unprecedented temporal and spatial resolution for in situ studies of LAM. Subsequently, we focus on fundamental case studies revealing the phase transformation dynamics in model HEAs and identify and quantify competing phase pathways. These results provide unprecedented quantitative insights into the governing mechanisms of non-equilibrium phase transformations, paving the way for rational alloy design and process optimization strategies in metal LAM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Entropy Alloys, Phase Transformations |