Growth of α and ω phase in Ti4733 detected by mechanical spectroscopy

This paper proposes a new way to detect the nucleation and growth of the ω and α phase in beta-metastable titanium alloy Ti4733. Samples were homogenized and quenched to a fully β microstructure state. Internal friction was measured by mechanical spectroscopy during heat cycles using a torsion pendulum. The first heating cycle has shown that internal friction increases during the nucleation of the ω and α phases. TEM analysis were performed in parallel to confirm the nucleation of those phases. Once the nucleation was finished (in subsequent cycles), the internal friction dropped to zero again. These maxima in internal friction related to precipitate nucleation were not reported before in such alloys. The present results show that mechanical spectroscopy could be used to better tailor the phase nucleation in β-metastable titanium alloys. •Mechanical spectroscopy was used to detect the nucleation and growth of ω and α phase Ti4733 titanium alloy.•The temperature for those nucleation was lower than previous studies but back up by TEM observation.•The nucleation of α phase on previously nucleated ω phase leads to a thinner and more homogeneous phase distribution.