Abstract
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.
Highlights
Metastable β-titanium alloys are an important class of alloys that have found use in demanding applications such as aircraft structures, engines, orthopaedic and orthodontic implants
Elastic properties of metastable β titanium alloys are strongly affected by the formation of elastically stiffer ωiso particles in the original β–matrix [2]
This work presents the study of the kinetics of the β→ωiso phase transformation by resonant ultrasound spectroscopy – i.e. the possibility to observe the ω phase formation through the measurement of evolution of elasticity
Summary
Metastable β-titanium alloys are an important class of alloys that have found use in demanding applications such as aircraft structures, engines, orthopaedic and orthodontic implants. Their high strength and, simultaneously, low Young's modulus, good corrosion resistance, excellent biocompatibility and ease of fabrication provide significant advantages compared to other high performance alloys [1]. The metastable bcc β phase decomposes to form equilibrium hcp α phase precipitates. Elastic properties (such as the low Young's modulus) of metastable β titanium alloys are strongly affected by the formation of elastically stiffer ωiso particles in the original β–matrix [2]. This work presents the study of the kinetics of the β→ωiso phase transformation by resonant ultrasound spectroscopy – i.e. the possibility to observe the ω phase formation through the measurement of evolution of elasticity
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