Formation of the structure and properties of β-type titanium alloy upon thermomechanical treatment

Abstract

The rapid quenching of β-type titanium alloy from 800°C and cold deformation by drawing (ε = 24%) leads to the formation of a cellular-banded structure with a cell size of 200 × 400 nm and high density of dislocations (~5 × 10¹⁴ m^–2). During subsequent aging at 450°C, the decomposition of the β-phase occurs with a heterogeneous precipitation (at dislocations) of plates of the α phase with a thickness of 10–30 nm and length of 50–100 nm. The small size and high density of α crystals (5 × 10²¹ m^–3) provide a substantial increase in the strength characteristics of the alloy.