Omega phase particles in LCB titanium alloy
Titanium alloys are generally two phase containing the hcp alpha – phase and bcc beta – phase. Also unstable omega phase is formed during aging of metastable beta-Ti alloys. It has been shown that volume fraction, distribution and size of omega particles are decisive for the mechanical properties. Ageing kinetics of omega phase formation is not fully understood. Extensive set of 30 samples has been prepared for ex-situ investigation. Three aging temperatures were utilized and ageing times of 15 minutes to 1024 hrs on logarithmic scale were employed. Different chemistry (Mo and Fe content) of omega particles and beta phase matrix allow the distinction of those particles in specimen. In-situ investigation (heating up to 900°C with rate of 1 - 5 °C/min) will give more insight to previously documented consequent phase transitions with growing temperature (beta to omega, omega to alpha, beta to alpha and finally alpha to beta). In-situ experiment is therefore also proposed. Investigation utilizing small angle neutron scattering at ILL will bring detailed information about omega phase particles size, shape and volume fraction in Ti LCB alloy that cannot be acquired by any other method.
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STRASKY Josef; HARCUBA Petr; JANECEK Milos; LINDNER Peter; RACK Henry and SMILAUEROVA Jana. (2013). Omega phase particles in LCB titanium alloy. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-127
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