The high-temperature deformation behavior of a novel near-α titanium alloy and hot-forging based on the processing map

Limited by the composition, the service temperature of high-temperature titanium alloys have been restricted to 600 °C for many years. In this study, a self-designed Ti–6Al–3Sn–10Zr-(Mo, Nb, W, Si) near-α titanium alloy that can be used at 650–700 °C was fabricated by vacuum arc remelting (name as DsTi700). Isothermal compression tests were performed at 975–1100 °C and in the strain rate range of 0.01–1 s⁻¹. The results indicate that the flow behaviors of DsTi700 alloy under high strain rate are different from that of some traditional near-α titanium alloys and the peak stress values are generally higher than those of some common near-α titanium alloys at the same/similar deformation conditions. The deformation activation energy Q in β phase field is 240.2 kJ/mol. Moreover, the processing map were developed to determine the optimal processing window. Finally, DsTi700 alloy pancake with basket-weave microstructure was successfully prepared by multi-pass hot-forging. Tensile tests exhibit that the elongation of DsTi700 alloy at room temperature is nearly 13%, the UTS exceeds 600 MPa at 650 °C, which is almost equal to the UTS of some traditional near-α titanium alloys at 600 °C. Moreover, the UTS and elongation of DsTi700 pancake are 511 MPa and 24.1% at 700 °C.