About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Alloy Phase Transformations at Elevated Temperatures
|
Presentation Title |
Precursor Metastable Phases and Their Influence on α Precipitation in the Metastable β-titanium Alloy, Ti-5Al-5Mo-5V-3Cr |
Author(s) |
Stoichko Antonov, Zachary Kloenne, Yufeng Zheng, Rongpei Shi, Hamish 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 by the thermo-mechanical treatment, during which formation of various nano-scaled phases occurs. The exploration of the structure and composition of these phases and their interplay with the ⍺ phase formation enables the understanding of the microstructural development. Subsequently, the knowledge can be used 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 ⍺. |