Fatigue strength and features of destruction ultrafine titanium alloy VT6

Abstract

 This work is devoted to the study cycle fatigue resistance of ultrafine-grained (UFG) alloy VT6 received equal channel angular pressing in combination with subsequent extrusion and annealing. Torsion fatigue tests with rotation in a symmetrical loading cycle subjected samples of VT6 alloy with bimodal (globular-plate) and UFG structure. It is shown that the fatigue strength of the alloy UMP was 40% higher than the fatigue strength of the alloy with a bimodal structure. The basic difference in the fracture surface of samples, discussed the impact of the UFG structure on resistance of the material origin and propagation of fatigue cracks.