| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Absorptivity Behavior of High Reflectivity Aluminum and Copper Alloys During Laser Powder Bed Fusion |
| Author(s) |
Sagar D. Patel, Troy R Allen, David Deisenroth, Madison K. Reed, Peyman Alimehr, Sergey Mekhontsev, James M. Fraser, Mihaela Vlasea |
| On-Site Speaker (Planned) |
Sagar D. Patel |
| Abstract Scope |
The higher reflectivity and conductivity of aluminium and copper alloys, when compared to other commonly used alloys, pose unique challenges when being manufactured using laser powder bed fusion (LPBF). As such, the physics of laser-material interactions are complex for LPBF of aluminium and copper alloys, leading to a costly process parameter development cycle. In this work, in situ reflectivity measurements are carried out for one aluminium and one copper alloy and compared to melt pool depths for multiple process parameters spanning the conduction, transition, and keyhole melting modes. The measurements for aluminium are carried out using an integrating sphere setup on a commercial LPBF system; while for copper, an integrating hemisphere on the LPBF testbed at NIST is used. The inferred absorptivity values are then analyzed using dimensionless parameters to develop material class specific absorptivity scaling laws, that would accelerate the process parameter development cycle for aluminium and copper alloys. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |