Growth kinetics of ellipsoidal ω-precipitates in a Ti-20 wt%Mo alloy under compressive stress

The influence of applied compressive stress on the growth kinetics of ellipsoidal omega-phase precipitates was investigated for a Ti-20 wt% Mo alloy aged at 300 degrees C. The application of compressive stress accelerated the growth of omega-precipitates when the misfit strain epsilon(M) of the precipitates along the loading direction is smaller than 0, whereas it did not essentially induce the same effect in cases where epsilon(M) > 0. The growth of the precipitates was interface-controlled in the case where epsilon(M) < 0 under a compressive stress of 450-550 MPa. The interface-controlled growth rate increased linearly with increasing compressive stress. The interface-controlled growth rate under a compressive stress was slower than that under the same tensile stress in the case of epsilon(M) > 0.