About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
Exploring Omega Phase Formation During DED and Its Role in Phase Evolution and Deformation Mechanism of Ti-Cr Alloys |
| Author(s) |
Yeonju Noh, Yejun Park, DongHyeon Chae, Pyuck-Pa Choi |
| On-Site Speaker (Planned) |
Yeonju Noh |
| Abstract Scope |
Directed Energy Deposition (DED) creates steep thermal gradients and cyclic reheating, potentially inducing athermal ω phase formation in metastable β-Ti alloys. This ω phase is hypothesized to serve as a precursor or nucleation site for α phase during subsequent thermal exposure, thereby influencing the phase transformation pathway.
In this study, ω phase formation was confirmed via Transmission Electron Microscopy (TEM) immediately after DED processing of a Ti–Cr binary alloy. Post-deposition heat treatments were applied to investigate the transformation of ω into α phase. The evolution of α was characterized using X-ray Diffraction (XRD) and Electron Backscatter Diffraction (EBSD), focusing on phase fractions and orientation relationships.
Atom Probe Tomography (APT) is planned to examine solute segregation near ω structures. Understanding the role of DED-induced ω phase in guiding α transformation may offer a new approach to microstructure design for strength–ductility synergy in titanium alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Phase Transformations |