| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Interfaces and Phase Transformations
|
| Presentation Title |
Refining Alpha Microstructure via Dual-phase Interface and Twin Boundary in Beta Titanium Alloys |
| Author(s) |
Dian Li, Xing Zhang, Yiliang Liao, Stoichko Antonov, Yufeng Zheng |
| On-Site Speaker (Planned) |
Dian Li |
| Abstract Scope |
The microstructural evolution in beta titanium alloys can be significantly modified using accurately designed thermomechanical treatment. The size, morphology and distribution of the hcp alpha precipitates in the bcc beta matrix can be tuned accordingly. By introducing dual-phase interface and twin boundary into the interior of beta grains, e.g., the pre-formed O”/beta interface and deformation twinning boundary, various fine-scale intragranular alpha microstructures can be produced. In this work, the structure and composition near the pre-formed O”/beta interface were investigated using advanced electron microscopy and atom probe tomography in a beta titanium alloy, Ti-5Al-5Mo-5V-3Cr (wt.%, Ti-5553). The microstructure near the boundary between the novel {10 9 3}<3 3 1> type deformation twin and beta matrix was characterized. The influence of pre-formed O”/beta interface and deformation twinning boundary on the formation of various fine-scale intragranular alpha microstructures produced in Ti-5553 using different thermomechanical treatments will be introduced. |