| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Alternative Processes (Beyond the Beam)
|
| Presentation Title |
A-47: Understanding Mechanisms Behind Morphological Changes in Gas Atomized Powders After Laser Irradiation |
| Author(s) |
Jonathan M. Skelton, Jerry A Floro, James M Fitz-Gerald |
| On-Site Speaker (Planned) |
Jonathan M. Skelton |
| Abstract Scope |
In laser powder-bed additive manufacturing, gas atomized powder is most commonly used due to its high flowability during recoating. If morphological anomalies occur in particles that are either ejected from the melt pool, or located in a heat affected zone around the edges of the build, defects could ensue due to changes in the rheology of the powder, resulting in uneven recoating after sieving operations. This research focuses on morphological changes observed in an Al-Cu eutectic alloy powder (1-100μm diameter) irradiated with a CW laser diode (450nm wavelength, power density = 8,000 W/cm2) on ITO-coated glass substrates. Particles were characterized with scanning electron microscopy before and after irradiation, clearly showing changes in microstructure and a range of collapsed surface features. Microstructural evidence suggests that the mechanism that produces these collapsed morphologies involves particles melting and solidifying within their oxide shell. Support of the NSF under grant DMR-1663085 is gratefully acknowledged |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |