About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Phase Evolution Sequence in a Precipitation-Strengthened High-Entropy Alloy Fabricated by Additive Manufacturing |
| Author(s) |
Matthew John Luebbe, Fan Zhang, Haiming Wen, Wen Chen, Andrew Chihpin Chuang, Jan Ilavsky |
| On-Site Speaker (Planned) |
Matthew John Luebbe |
| Abstract Scope |
High-entropy alloys (HEAs) are a novel class of alloys with great potential for application in harsh environments. Precipitation-hardened HEAs are essential for improving high-temperature strength and irradiation resistance. Additive manufacturing (AM), while useful for making parts with internal geometry, can often drastically change the solidification sequence compared to a cast alloy, as well as changing the microstructure to alter precipitation kinetics. A precipitation HEA, (Fe<sub>0.3</sub>Ni<sub>0.3</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub>)<sub>88</sub>Ti<sub>4</sub>Al<sub>8</sub>, was developed and produced via powder bed fusion and subsequently aged to produce additional precipitates. Both solidification and aging were observed in-situ using synchrotron XRD and as-printed and aged samples were characterized with SEM, EBSD, and TEM. Results indicated that the ordered B2 phase formed before the disordered FCC during rapid solidification. Aging introduced additional precipitates, including a Chi phase which forms around and sometimes inside of the B2 phase, as well as nanoscale L1<sub>2</sub> for strength, which avoids the B2 phase. |
| Proceedings Inclusion? |
Undecided |