| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
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 |
Melting and Solidification Dynamics During Laser Melting of Reaction-Based Metal Matrix Composites Uncovered by In-Situ Synchrotron X-Ray Diffraction |
| Author(s) |
Minglei Qu, Jiandong Yuan, Ali Nabaa, Junye Huang, Chihpin Andrew Chuang, Lianyi Chen |
| On-Site Speaker (Planned) |
Minglei Qu |
| Abstract Scope |
Laser additive manufacturing (AM) of reaction-based metal matrix composites (MMCs) involves highly complex material transformation behavior, including melting, dissolution, precipitation, and solidification. Yet, the dynamics and interplay of these phase transformation processes remain poorly understood, posing substantial challenges in predicting and controlling microstructure. Here we performed the in-situ X-ray diffraction experiment during laser melting of 316L+10vol.%TiC, which provides direct and quantitative insights into the complex phase transformation dynamics during laser AM of reaction-based MMCs. Further in-depth thermodynamic and kinetic calculations reveal that most of the phase evolution behavior observed in the in-situ X-ray diffraction experiment cannot be solely explained by widely used equilibrium thermodynamic models, and diffusion-controlled nonequilibrium dissolution and precipitation kinetics must be considered to elucidate the complex phase evolution behavior, including incomplete TiC dissolution, and three-step TiC precipitation. The findings of our research provide the knowledge foundation for the design of unique microstructures and advanced MMCs through AM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Composites |