MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||7|
|Section||Microstructure - Properties Relationships|
|Published online||12 October 2020|
In-situ characterization of growth of isothermal ω phase in metastable β-Ti alloy TIMETAL LCB
1 Institute of Thermomechanics, Czech Academy od Sciences
2 Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
3 Université de Lorraine, CNRS, IJL, F-54000, Nancy, France
* presenting author, email: email@example.com
Metastable β-Ti alloys exhibit various solid-solid phase transitions. Our study is focused on the characterization of the diffusion controlled β→ωiso phase transition. The particles of ω phase play an important part in thermomechanical treatment since they serve as heterogeneous nucleation sites for precipitation of finely dispersed particles of hexagonal α phase. The in-situ observation of the growth of particles of ω phase could be difficult by conventional techniques. However, it was shown recently that the ω phase significantly influences the elastic constants of the material, and the different forms of ω phase have different effects on the elastic anisotropy, as well as on the internal friction coefficients. Therefore, the β→ω phase transformation could be in-situ observed by the precise measurement of the tensor of elastic constants. In this contribution, we present the study of the kinetics of the β→ωiso phase transformation by resonant ultrasound spectroscopy. The polycrystalline samples of TIMETAL LCB alloy were in-situ examined by this technique during isothermal and non-isothermal ageing at temperatures up to 300 °C.
© The Authors, published by EDP Sciences, 2020
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