Ultrasonic characterization of beta to omega phase transformation in metastable beta-titanium alloysThursday (09.11.2017) 09:55 - 10:15 Part of:
The finely dispersed particles of metastable hcp ω-phase form from the parent bcc β-phase and significantly influence mechanical properties of titanium alloys. In this contribution, we present results of a study of the thermally induced β→ω (so called athermal and isothermal ω phase) transformation by resonant ultrasound spectroscopy. It is observed that the different forms of omega–phase have different influence on the elastic anisotropy of the material, as well as on the internal friction coefficients and on the temperature dependences of the elastic constants. The high sensitivity of the resonant ultrasound spectroscopy enables us to study in-situ reversibility/irreversibility of the formation of isothermal ω and athermal ω phase and the kinetics of this formation.