About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Lightweight Alloy Matrix Composites
|
| Presentation Title |
Ultra-Low Modulus in Laser Printed Ti-25Nb |
| Author(s) |
Wenhao Lin, Abayomi Adewale Akinwande, Helge Heinrich, Ji Ma |
| On-Site Speaker (Planned) |
Abayomi Adewale Akinwande |
| Abstract Scope |
Biomedical implants require a low elastic modulus similar to that of cortical bones (20-25 GPa). This requirement continues to pose a challenge in additive manufacturing because typical laser powder bed fusion (LPBF) parameters rarely achieve moduli below 50 GPa. In this study, we employed an unconventional 10 µm hatch spacing and compared the outcome with commonly employed hatch spacing (120 µm) in the fabrication of Ti25Nb. Associated with 10 µm spacing is lateral epitaxy grain growth, which formed a strong {101}𝛽 texture parallel to laser movement, and the distinct ladder-like hierarchical structure initiated by the intersection of dendritic boundaries and melt pool boundaries. This led to deformation compartmentalization and suppressed long-range martensitic transformation, which consequently favored a locally modulated 𝑂′-phase and a low modulus of 32 GPa. This finding is opposed to the 67 GPa result obtained for 120 µm spacing, where strip-like grain colonies and vertical epitaxy were observed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Biomaterials, Titanium |