| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Probing Processing Defects in Novel Refractory High Entropy Alloys via In-situ Dynamic X-ray Radiography |
| Author(s) |
Jerard Gordon |
| On-Site Speaker (Planned) |
Jerard Gordon |
| Abstract Scope |
Single phase body-centered cubic (BCC) refractory high entropy alloys (RHEAs) are novel materials containing multiple principal elements in high concentrations which exhibit excellent high-temperature strength and strength retention at temperatures surpassing the melting points of conventional Ni-based superalloys. However, RHEAs generally lack appreciable room-temperature ductility resulting in critical defect formation during manufacturing and/or premature failure during mechanical loading. Additionally, RHEAs may be susceptible to solidification cracking under metal additive manufacturing (AM) processing. We present results for two novel RHEAs with potential room temperature ductility under rapid solidification environments representative of laser-powder bed fusion (L-PBF). In-situ melt pool analysis using synchrotron dynamic x-ray radiography (DXR) revealed characteristic gas and keyhole porosity within different regions of process space. Variations in keyhole depth was discovered between compositions, likely due to differences in elemental vaporization. Overall, minimal solidification cracking was observed during laser scanning, displaying the potential of these alloys for bulk high-temperature materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Entropy Alloys, High-Temperature Materials |