Superplastic properties of Ti–45.2Al–3.5(Nb,Cr,B) sheet material rolled below the eutectoid temperature

A novel processing route consisting of two-stage forging followed by sheet rolling below the eutectoid temperature was applied to a Ti–45.2Al–3.5(Nb,Cr,B) alloy. The proposed process provided sheet with excellent and isotropic superplastic properties in the temperature range of 1000–1100 °C. Using a strain rate of 10−3 s−1 elongation of up to 330–550% were measured with flow stresses at 50% true strain ranging between 60 and 140 MPa. It is thought that the developed processing route is more cost-effective when compared with currently used processing routes, which include sheet rolling above the eutectoid temperature.