About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Metal Matrix Composites: Processing, Additive Manufacturing, and Applications
|
| Presentation Title |
Mechanisms of Oxide Loss During Laser Powder Bed Fusion of Oxide Dispersion-Strengthened Alloys |
| Author(s) |
Nathan A. Wassermann, Benjamin Mejia Diaz, Lin Shao, Alan McGaughey, Sneha Narra |
| On-Site Speaker (Planned) |
Nathan A. Wassermann |
| Abstract Scope |
Oxide nanoparticles are commonly added to alloy feedstock to manufacture oxide dispersion-strengthened (ODS) alloys by laser powder bed fusion (L-PBF). However, over 80% of the added oxide can be lost during processing, potentially limiting the mechanical performance of fabricated parts. Although oxide loss has been widely reported in prior studies, the relative contributions of different loss mechanisms remain poorly understood. In this work, we investigate three potential pathways for oxide loss: vaporization, surface accumulation, and spatter ejection. Vaporization losses are assessed using a numerical model based on the Hertz–Knudsen–Schrage equation, while surface accumulation and spatter ejection are evaluated using chemical analysis and electron microscopy. The results show that approximately 20% of the added oxide can accumulate at part surfaces. A significant fraction of oxide can also be lost to spatter and vaporization. The results inform future efforts to predict and control oxide content in additively manufactured ODS alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Composites |