Abstract
A near-β Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was hot rolled at 700 °C with a total thickness reduction of 20%, 40%, 60%, and 80%, respectively. The microstructural evolution was analyzed using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The mechanical properties, including the strength and ductility, were also examined. The microstructural evolution of the hot-rolled alloy can be described as a serial “rotation-bending-fragmenting-spheroidization” process of the lamellar α phase and the dynamic recrystallization of the matrix β phase. The microstructures, including the orientation relationship, the distribution of dislocations, and the formation of {101̅1} twins and other substructures, were systematically discussed. According to the results of the tensile tests, the strength increased while the ductility decreased with increasing thickness reduction, due to the evolution of dislocation substructures. In addition, the alloy was dominated by a mixed fracture mechanism of micro-void coalescence and intergranular fracture after hot rolling with a small thickness reduction, but exhibited a quasi-cleavage fracture mechanism after hot rolling with a large thickness reduction.
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