About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Microstructure evolution and mechanical performance of cold metal transfer-based wire-arc additively manufactured titanium alloys |
| Author(s) |
Adedoyin Michael Lasisi, Ehsan Farabi, Sophie Primig, Thomas Klein, Jose L. Neves |
| On-Site Speaker (Planned) |
Adedoyin Michael Lasisi |
| Abstract Scope |
Wire-arc directed energy deposition via the cold metal transfer (CMT) technology enables efficient fabrication of large Ti-alloy components with low waste. However, complex thermo-mechanical profiles promote heterogeneous microstructures and anisotropic properties. This study seeks to better understand the microstructure evolution and deformation behaviour of two Ti-alloys processed via CMT, i.e., Ti6Al4V and the high-temperature alloy Ti6Al2Sn4Zr2Mo. We show that CMT successfully limits epitaxial growth of β-phase grains while inducing local compositional heterogeneities. Microstructure refinement unlocks a more isotropic mechanical response when compared to other additive manufacturing techniques. However, chemical partitioning results in variations of α-lath size and local mechanical heterogeneities. Additionally, CMT promotes limited grain boundary α variant selection and macro-texture zones, limiting the number of easy crack growth paths and enhancing the strength and ductility of the final product. These results underline the potential of CMT as a method for manufacturing large-scale Ti components for next-gen aerospace applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Characterization |