Crystallographic Features of Phase Transformations in Titanium Alloy VT6

Special feature of formation of local texture of α- and β-phases in polymorphic transformation in titanium alloy VT6 are studied by orientation microscopy (EBSD). The specimens are treated by an isothermal hold in the single-phase β-range at 1065°C and cooled in water, in air, or with the furnace. The crystallographic misorientations of crystallites in the α-phase and between the α- and β-phases are studied. It is shown that a dominant shear component is typical for polymorphic transformations occurring at any cooling rate. A secondary β-phase precipitated during the cooling in the (α + β)-range differs in its orientation from the high-temperature β-phase.