An ultrasound-based evaluation of cubic symmetry preservation and homogeneity in elastic behavior of β+ω and β+α Ti-alloys

0579541 - ÚT 2024 RIV GB eng J - Journal Article
Olejňák, J. - Janovská, Michaela - Sedlák, Petr - Repček, K. - Stoklasová, Pavla - Grabec, Tomáš - Šmilauerová, J. - Harcuba, P. - Stráský, J. - Janeček, M. - Seiner, Hanuš
An ultrasound-based evaluation of cubic symmetry preservation and homogeneity in elastic behavior of β+ω and β+α Ti-alloys.
Materials and Design. Roč. 236, December (2023), č. článku 112474. ISSN 0264-1275. E-ISSN 1873-4197
R&D Projects: GA ČR(CZ) GA20-12624S
Institutional support: RVO:61388998
Keywords : β-Ti alloys * secondary phases * cubic symmetry * resonant ultrasound spectroscopy * transient grating spectroscopy
OECD category: Acoustics
Impact factor: 8.4, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0264127523008894

Elastic constants of dual-phase β-titanium alloys with different phase compositions and different volume fractions of individual phases were investigated using resonant ultrasound spectroscopy and transient grating spectroscopy. It was shown that even for high volume fractions of the secondary phases (ω and α), the crystals can retain cubic symmetry and homogeneity in their elastic behavior, both at the macro-scale and at the micro-scale, unless the secondary phases precipitate under external stress violating this symmetry. In contrast, a material heat-treated under uniaxial compression deviates from cubic symmetry in its macroscopic behavior, and its micro-scale elastic behavior is heterogeneous. The results also reveal that the ω and α particles have different impacts on the elastic constants of the β-matrix, the former affecting only the shear part of the elastic response, while the latter also the bulk modulus.
Permanent Link: https://hdl.handle.net/11104/0348444