About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
|
| Presentation Title |
Multi-Material Mixing Mechanisms Process Map |
| Author(s) |
Zane W. Taylor, Tharun Reddy, Kamel Fezzaa, Samuel Clark, Leora Dresselhaus-Marais |
| On-Site Speaker (Planned) |
Zane W. Taylor |
| Abstract Scope |
Liquid-state mixing is a necessary prerequisite for in-situ alloying and multi-material printing in laser fusion-based additive manufacturing. We will present a mechanistic discussion of the fluid mixing process in the laser powder bed fusion of copper powder on a titanium substrate. In-situ synchrotron radiography and post-mortem X-ray computed tomography reveal the expected mixing improvement at high energy densities and low laser scan speeds due to slow Marangoni convection and diffusion, as well as an unexpected transition to high-velocity fluid-shear driven mixing mechanisms at higher scan speeds associated with the traditional balling regime. These results indicate fundamental tradeoffs between driving forces for mixing during the laser scanning process, and suggest that certain high-scan speed processing conditions may improve mixing and in-situ alloying without introducing more serious keyholing defects. |
| Proceedings Inclusion? |
Undecided |