| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defect and Phase Transformation Pathway Engineering for Desired Microstructures
|
| Presentation Title |
Tuning Fine-scale Alpha Microstructures via Nano-scale Structural and Compositional Non-uniformities in Beta Titanium Alloys |
| Author(s) |
Dian Li, Rongpei Shi, Rajarshi Banerjee, Yunzhi Wang, Hamish Fraser, Yufeng Zheng |
| On-Site Speaker (Planned) |
Yufeng Zheng |
| Abstract Scope |
The microstructures in beta titanium alloys mainly contain the hcp alpha precipitates and the bcc beta matrix, generated by the precipitation reaction during the aging treatment. In general, alpha precipitates prefer to nucleate along the beta grain boundary and form a thick layer of grain boundary alpha microstructure. However, by introducing different defects into the interior of beta grains, e.g., nano-scale compositional and structural non-uniformities via the intermediate phases, various fine-scale intragranular alpha microstructures can be produced in the beta titanium alloys. In this work, the influence of nano-scale intermediate phases on the local structure and composition was investigated using aberration-corrected S/TEM and atom probe tomography. The extra driving force from these structural and compositional non-uniformities for the subsequent alpha precipitation was studied using phase field modeling. Various fine-scale intragranular alpha microstructures produced using different effects of these intermediate phases will be introduced in detail. |
| Proceedings Inclusion? |
Planned: |