About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| 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 |
Operando Multiscale X-ray Imaging of Defects & Alloying at XFELs in LPBF |
| Author(s) |
Leora E. Dresselhaus-Marais |
| On-Site Speaker (Planned) |
Leora E. Dresselhaus-Marais |
| Abstract Scope |
Laser powder-bed fusion (LPBF) enables new design paradigms for metals manufacturing, but uncertainties persist in process optimization for the desired properties. Operando X-ray radiography has revealed complex competition between multi-physics phenomena during the melt and solidification processes, resulting in variable turbulence during competition between keyholing, Marangoni flows, heat transfer, etc. For functionally-graded materials (FGMs), in-situ alloy mixing is highly sensitive to these multiphysics phenomena, however, their functionality is challenging to control. We developed the first LPBF experiments that use X-ray free electron lasers whose femtosecond-duration pulses and monochromatic 10^12 photons per pulse enable a new view of LPBF. Using simultaneous multi-modal imaging at the mm- and um- scales, we reveal the formation of voids and defects as well as different modes of alloy mixing in different regions of the melt pool. The insights from our novel microscopes hold profound opportunities for LPBF physics and FGM control. |
| Proceedings Inclusion? |
Planned: |