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 |
Keyhole driven mixing mechanisms revealed by XFEL-based multiscale MHz microscopy |
| Author(s) |
Zane W. Taylor, Tharun Reddy, Jayanath Koliyadu, Tokushi Sato, Steven van Petegem, Frank Seiboth, Lichao Fang, Cesar Diaz-Caraveo, Patrik Vagovic, Leora Dresselhaus-Marais |
| On-Site Speaker (Planned) |
Zane W. Taylor |
| Abstract Scope |
Metal additive manufacturing is a revolutionary technology offering unmatched fabrication capabilities with precise control over the spatial distribution of materials and microstructures within a part. The fluid dynamics dictate the melt pool geometry, mixing, and solidification. Here, we implement the first multiscale MHz microscope at the EuXFEL combining radiography and transmission X-ray microscopy (TXM) to resolve lengthscales between 0.3µm and 800µm with µs time resolution to probe the mixing of copper into aluminum under laser powder-bed fusion conditions. The multiscale microscope directly observed that mixing behaviors dramatically differ across three distinct zones of the melt pool. Specifically, we identify local microvortices induced by keyhole oscillations as the primary mechanism enabling solute mixing. This multiscale microscope and results provide a fundamental understanding into fluid flow enabled mixing in laser melting processes, and a pathway to develop strategies for fabricating metallic parts from dissimilar alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Other |