Mechanical properties of complex alloyed titanium after severe plastic deformation

Object. Increasing of stability and mechanical properties level of titanium alloy by means of mechanical-thermal treatment Methodology. Titanium alloy ВТ25У in submicrocrystalline and heat treated condition was exploited as incoming billets. Microstructure investigations, severe plastic deformation, heat treatment and mechanical tests were held. Results.. Specimens with increased level of mechanical properties and stabilized structural condition were obtained. It was ascertained that SPD by method of screw extrusion due to large deformation degree and associated increasing of dislocation density provides formation of uniform structure with saving of titanium billet incoming linear size. Further isothermal annealing leads to stress relaxation and stabilization of alloy structural condition. Scientific novelty..Qualitative structure changes and mechanical properties increased level of complex alloyed titanium were revealed. Practical value. Submicrocrystalline structure formation provides changes of mechanical properties of complex alloyed titanium under elevated temperatures, that is perspective for practical application in aviation industry.