About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Grain Boundary α Precipitation Pathways in the Metastable β-Titanium Ti-5Al-5Mo-5V-3Cr |
| Author(s) |
Stoichko Antonov, T.S. Prithiv, Zachary Kloenne, Saurabh Mohan Das, Dian Li, Yufeng Zheng, Hamish L. Fraser, Baptiste Gault |
| On-Site Speaker (Planned) |
Stoichko Antonov |
| Abstract Scope |
This study explores the mechanisms behind the formation of the detrimental grain boundary ⍺ phase in the metastable β-titanium alloy Ti–5Al–5Mo–5V–3Cr–0.5Fe (wt.%). Using correlative electron microscopy and atom probe tomography, we analyzed grain boundary chemistry in both the as-quenched and aged conditions. Significant segregation of α-stabilizing elements and depletion of β-stabilizers were observed at grain boundaries. Upon heating, multiple α precipitates nucleate along boundaries and later merge into plates during aging. Boron and carbon were found to play different roles during the grain boundary α formation. Yttrium additions led to Y₂O₃ particle formation at grain boundaries and a localized reduction in oxygen, as revealed by 3D imaging and composition data. These results offer critical insight into the nucleation and growth behavior of grain boundary α in β-Ti alloys and suggest alloying strategies to suppress its formation. |