Isothermal Aging Precipitate of TB17 Titanium Alloy

• Main Authors: WANG Zhe, WANG Xinnan, ZHU Liwei, ZHU Zhishou
• Format: Article
• Language: zho
• Published: Journal of Aeronautical Materials 2016-10-01
• Series: Journal of Aeronautical Materials
• Subjects: TB17 titanium alloy; isothermal aging; secondary α phase; precipitation
• Online Access: http://jam.biam.ac.cn/CN/10.11868/j.issn.1005-5053.2016.5.001

Transmission Electron Microscope (TEM), X-Ray Diffraction(XRD) and Optical Microscope(OM)were employed to investigate the aging precipitation behavior of a new type of ultra-high strength TB17 titanium alloy. The results show that during heat solution treated in the β phase field followed by aging the secondary α phase is nucleated, precipitated and grew on the β phase matrix,and the precipitated phase is lamellar structure which has burgers relation with the matrix. The secondary α phase content is increased rapidly and finally reach a steady-state as aging time increased and the final product of aging consists of α phase and β phase. there is a good linearity relationship between the content of secondary α phase and the hardness of age hardening. The TB17 titanium alloy isothermal phase transformation kinetics can be described by JMAK equation.