Tensile deformation behavior of a near-α 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 -60 degrees to 900 degrees and a strain rate of 10(-3) s(-1). Electron backscatter diffraction (EBSD) tests were used to analyze the evolution of microstructure and deformation mechanisms under different temperatures. The results indicate that deformation mechanisms vary with the deformation conditions. At relatively low temperatures, -60 degrees, 23 degrees, and 400 degrees, dislocation slips mechanism dominates the deformation, even though tensile twinning is detected. While globularization of alpha laths and dynamic recrystallization (DRX) are dominant at high temperatures, 600 degrees and 800 degrees, resulting in the flow softening. During the deformation under different temperatures, the beta phase plays a crucial role in accommodating deformation between alpha and beta phase by migration of grain boundaries and rotation of grain, leading to a dramatically change in texture of beta phase. (C) 2020 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).