Effect of prestrain and aging treatment on microstructures and tensile properties of Ti-10Mo-8V-1Fe-3.5Al alloy

Higher strength and lower ductility have been observed in the prestrained and aged Ti-10Mo-8V-1Fe-3.5Al (TB3) alloy. In order to improve the ductility of prestrained TB3, two-step aging treatment was introduced. Tensile tests showed that the elongation of prestrained samples was increased to the same level of the unstrained and peak-aged ones without decrease in strength by the two-step aging. Transmission electron microscopic (TEM) examinations revealed that dislocations introduced by prestrain were almost eliminated by the two-step aging treatment, which was proposed to be the main cause for the ductility recovery. In addition, in the prestrained and aged TB3 samples, parallel α plates of one variant were generally observed under TEM.