Effects of hot compression and heat treatment on the microstructure and tensile property of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy

The present work investigated the effects of hot compression and heat treatment on the microstructure and tensile property of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy with a widmanstätten microstructure. During hot compression at 995 °C, the lamellar α phase in the widmanstätten structure was distorted, and an equiaxed microstructure was obtained by subsequent duplex annealing of the hot-compressed sample. The tensile strength and elongation were significantly improved by hot compressing at 995 °C. Duplex annealing treatment resulted in a further increase in ductility at the expense of slight decrease in strength. A good combination of tensile strength (990 MPa) and elongation (12.8%) has been obtained by hot compression at 995 °C followed by the duplex annealing treatment.