Tensile deformation behavior of a near-titanium alloy Ti-6Al-2Zr-1Mo-1V under a wide temperature range

Isothermal tensile tests have been performed to study the mechanical evolution of Ti-6Al-2Zr-1Mo-1V titanium alloy under a wide temperature range from â'60°to 900°and a strainrate of 10<â'3</s<-1</. Electron backscatter diffraction (EBSD) tests were used to analyze the evo-lution of microstructure and deformation mechanisms under different temperatures. Theresults indicate that deformation mechanisms vary with the deformation conditions. At rel-atively low temperatures, â'60°, 23°, and 400°, dislocation slips mechanism dominates thedeformation, even though tensile twinning is detected. While globularization of α laths anddynamic recrystallization (DRX) are dominant at high temperatures, 600â-and 800â-, result-ing in the flow softening. During the deformation under different temperatures, the β phaseplays a crucial role in accommodating deformation between α and β phase by migrationof grain boundaries and rotation of grain, leading to a dramatically change in texture of β phase.