|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Mechanisms of Grain Boundary α Precipitation in the Metastable β-Titanium Ti-5Al-5Mo-5V-3Cr
||Stoichko Antonov, T.S. Prithiv, Zachary Kloenne, Yufeng Zheng, Rongpei Shi, Hamish Fraser, Baptiste Gault
|On-Site Speaker (Planned)
We studied the driving force for and precipitation mechanism of the deleterious grain boundary ⍺ phase formed during the aging of the β-titanium alloy, Ti–5Al–5Mo–5V–3Cr–0.5Fe (wt.%). We probed the composition of different grain boundaries and present phases from the as-quenched β condition and after heating and aging using correlative electron microscopy and atom probe tomography. Our analysis reveals strong segregation of some α-stabilizing elements along with a depletion of β-stabilizing elements. Subsequently, multiple α precipitates nucleate along the grain boundary during heating to the aging temperature, and conglomerate during the aging to form the α plates. Interestingly, B and C play very different roles in the nucleation and growth of the α precipitates. This work provides essential insight into the formation of the undesired grain boundary ⍺ layers along prior-β grain boundaries in metastable β-Ti alloys.
||Titanium, Characterization, Phase Transformations