About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
In Tribute to Robert Wagoner: A Pioneer in Metal Forming and Constitutive Modeling
|
| Presentation Title |
Activating Multiple Deformation Modes for High Strain Hardening in Additively Manufactured Ti-Alloys |
| Author(s) |
Tianlong Zhang, Chain-Tsuan Liu, Yunzhi Wang |
| On-Site Speaker (Planned) |
Yunzhi Wang |
| Abstract Scope |
For critical applications, high strain-hardening rates are not only beneficial but essential for ensuring performance, safety, and manufacturability (e.g., in high-precision forming). Ti-alloys exhibit many desired properties for advanced applications. However, their widespread adoption has been hindered by limited strain-hardening ability and a tendency toward strain softening. In this presentation, we report Ti-alloys with high work-hardening capability enabled by additive manufacturing (AM). Using a mixture of powders of Ti-6Al-4V and beta stabilizers, the strong mechanical mixing and incomplete chemical mixing in the melt pools of L-PBF produce fine-scale concentration modulation (microCM) of beta stabilizers that leads to fine-scale dual-phase microstructures in as-built components. During deformation, different mechanisms, including dislocation plasticity, TRIP, and TWIP, are activated at different locations and stress levels, offering the as-built microCM alloys both high yield stress and high strain-hardening rate. These studies demonstrate a powerful strategy for engineering microCM Ti-alloys by AM with superior strain-hardening performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Phase Transformations, Additive Manufacturing |