MODIFICATION OF THE PROPERTIES OF VT1-0 NANOSTRUCTURED TITANIUM ALLOYUSING VARIOUS INFLUENCES

It was studied effects of electron irradiation (energy E=10 MeV, dose D=5∙1019 сm-2) and ultrasonic treatment (f=20 kHz, T=300 K, t=30 min) on the evolution of the structure and creep of VT1-0 titanium alloy in two structural states: industrial production and obtained by the method of intensive plastic deformation (IPD). The relationship between the structural states obtained as a result of these effects and the regularities of plastic deformation development during creep was established. It has been shown that at test temperatures of 20 and 350 °C, the strength characteristics of the VT1-0 alloy in the nanostructured state increase by 1.5–2 times compared to the characteristics of the industrial alloy. The created nanostructure is resistant to subsequent deformation under creep conditions at a test temperature of 20 °C and after electron irradiation, as well as ultrasonic treatment, retains high strength properties and has prospects for practical application at temperatures in the region of 20 °C. At test temperature of 350 °С, the deformation nanostructure is destroyed due to the development of recrystallization processes. Electron irradiation and ultrasonic treatment lead to an increase in strength, which is associated with a slowdown in recrystallization processes and the formation of new deformation boundaries (polygonal boundaries, microtwins), which are more resistant to tensile loads. The reason for the hardening may also be the low energy of the stacking fault of the VT1-0 alloy.