| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
|
| Presentation Title |
Phase Stability of Dual-Phase CoCrFeNiTi High Entropy Alloys Synthesized via Laser-Directed Energy Deposition Under Heavy Ion Irradiation |
| Author(s) |
Shunyu Liu, Som Dixit, Wei-Ying Chen, Meimei Li |
| On-Site Speaker (Planned) |
Shunyu Liu |
| Abstract Scope |
High entropy alloys (HEAs) represent potential radiation-tolerant structural materials for applications in extreme environments. Laser-directed energy deposition (LDED), an additive manufacturing method, has obtained increasing attention for synthesizing HEAs due to its flexibility in tuning HEA compositions. However, the unique thermal history of LDED often leads to microstructural heterogeneity with non-uniform compositions and secondary phases, particularly when blended powder mixtures are used as feedstock materials. This presentation will focus on LDED-synthesized CoCrFeNiTi HEAs that feature a dual-phase structure consisting of an FCC matrix and various secondary phases. A comparison of the phase structure of LDED CoCrFeNiTi with their cast counterparts will be provided. These HEAs were irradiated under dual-beam 1 MeV Kr2+ heavy ions up to 10 displacements per atom (dpa) and 600 °C at the IVEM-Tandem facility at Argonne National Laboratory. In situ transmission electron microscopy was employed to reveal the phase transformation and defect evolution under irradiation. |