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 |
In Situ Synchrotron Imaging of Hydrogen Bubble Dynamics in a Recycled Aluminum Alloy during Laser Directed Energy Deposition |
| Author(s) |
Sizhe Xu, Jianyue Zhang, Rama Diop, Michael Drakopoulos, Alan Luo, Sarah Wolff |
| On-Site Speaker (Planned) |
Sizhe Xu |
| Abstract Scope |
The high solubility of hydrogen in molten aluminum presents a persistent challenge in the additive manufacturing of aluminum alloys, often resulting in hydrogen bubble formation and subsequent balling defects in the as-fabricated components. Owing to their transient and dynamic nature, these bubbles are difficult to characterize using conventional imaging techniques. In this study, in situ synchrotron X-ray imaging was employed to directly observe hydrogen bubble behavior during the laser directed energy deposition (LDED) of recycled aluminum alloys. The observations reveal that hydrogen bubbles preferentially nucleate near the bottom of the melt pool and are subsequently entrapped due to rapid solidification and restricted outgassing pathways associated with high cooling rates. These findings provide critical insights into the mechanisms of hydrogen-induced porosity and inform the development of effective mitigation strategies for improving part quality in LDED-processed aluminum systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Sustainability |