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 widmanstatten microstructure. During hot compression at 995 degrees C, the lamellar a phase in the widmanstatten 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 degrees 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 degrees C followed by the duplex annealing treatment. (C) 2007 Elsevier B.V. All rights reserved.