Influence of deformation parameters on microstructure and mechanical properties of TA15 titanium alloy
(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The influence of deformation parameters including deformation temperature, degree and speed on the microstructure and mechanical properties of TA15 titanium alloy was studied. The volume fraction, size and aspect ratio of primary α phase in deformed TA15 titanium alloy were quantitatively characterized. With increasing deformation temperature, the volume fraction and size of primary α phase decrease. The aspect ratio of primary α phase decreases with increasing deformation temperature. The tensile strength of TA15 alloy deformed at 0.1 mm/s is higher than that at 0.3 mm/s. After thermoforming at 960 ℃, 0.1 mm/s, the tensile strength is the highest up to 1 035 MPa and the elongation is 13.5%. When the thermoforming temperature is 1 050 ℃, the strength and elongation are both relative low, because the microstructure is Widmanstaten structure.
Key words: TA15 titanium alloy; deformation; microstructure; mechanical properties