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Lecture

Evolution of elastic constants of Ti-15Mo single crystals with thermal treatment

Thursday (07.11.2019)
09:35 - 09:55
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Resonant ultrasound spectroscopy and Transient Grating Spectroscopy were used for characterization of the diffusion controlled β→ ω phase transition in metastable β-Ti alloy Ti-15Mo. Ultrasonic methods are suitable tool for monitoring of β→ ω phase transition, because elastic constants of metastable β-Ti alloys are significantly influenced by formation of isothermal ω particles. Single crystals of metastable β-phase of the Ti-15Mo alloy with different heat treatments (isothermal/anisothermal ageing at different temperatures, ageing under uniaxial [111] loading) were studied with aim to observe dependence of elastic constants on formation of isothermal ω particles. Resonant ultrasound spectroscopy was used for observation of the temperature evolution of the elastic constants and Transient grating spectroscopy for determination of the local material symmetry at a fixed temperature. The results of our measurements show that the isothermal ω particles exactly follow the original cubic symmetry of the β matrix.


 

Speaker:
Dr. Michaela Janovská
Czech Academy of Sciences
Additional Authors:
  • Jitka Nejezchlebová
    Czech Academy of Sciences
  • Dr. Petr Sedlák
    Czech Academy of Sciences
  • Tomáš Grabec
    Czech Academy of Sciences
  • Dr. Pavla Stoklasová
    Czech Academy of Sciences
  • Dr. Jana Šmilauerová
    Faculty of Mathematics and Physics, Charles University
  • Prof. Miloš Janeček
    Faculty of Mathematics and Physics, Charles University
  • Dr. Hanuš Seiner
    Czech Academy of Sciences