| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Atom Probe Tomographic Study of Precursor Metastable Phases and Their Influence on α Precipitation in the Metastable β-titanium Alloy, Ti-5Al-5Mo-5V-3Cr |
| Author(s) |
Stoichko Antonov, Yufeng Zheng, Hamish L. Fraser, Baptiste Gault |
| On-Site Speaker (Planned) |
Stoichko Antonov |
| Abstract Scope |
The microstructural evolution and mechanical performance of metastable β-titanium alloys can be significantly influenced the thermo-mechanical treatment, causing formation of various nano-scaled phases. The exploration of these phases in β-Ti alloys, and their interplay with the ⍺ phase, is tremendously important as a lever to tailor the microstructure, and consequently the mechanical properties. In this study, we used in-situ and ex-situ conventional and aberration-corrected scanning/transmission electron microscopy and atom probe tomography to characterize the cascade of metastable phases forming in Ti-5Al-5Mo-5V-3Cr during heating to aging temperature, as well as their influence on the ⍺ distribution. The results show that the nucleation of ⍺ is strongly influenced by phases formed by diffusional-displacive transformations and are rich in Ti - ⍵, ⍺ʺ, and Oʺ - that serve as intragranular nucleation sites for ⍺. This work paves the way for exploiting this cascade of metastable phases for further microstructural engineering of Ti-alloys. |
| Proceedings Inclusion? |
Planned: |