Abstract
The properties and microstructure evolution of Ti-5Al-5Mo-5V-1Cr-1Fe alloy with bimodal microstructure during uniaxial fatigue were investigated. The results showed that, the elastic modulus, ultimate strength and elongation decreased by 14.8%, 15.7%, and 92% respectively at the late stage of fatigue, under conditions of frequency f = 10 Hz and stress ratio R = 0 (σmax = 0.75σ0.2) at room temperature. Dislocation gliding along {1 0 1}β cut secondary α phase (αs) into fragments through twin, stacking fault and shear band, resulting in αs dissolving. This induced the decay of mechanical properties. The dissolving of αs inferred the microstructural design strategy in high strength titanium alloys by introducing αs phase.
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