FORMATION OF NANOSTRUCTURE AND MECHANICAL PROPERTIES OF TITANIUM WITH DIFFERENT PURITY

The effect of quasi-hydrostatic extrusion at liquid nitrogen temperature and room temperature on the evolution of structure and mechanical properties of iodide titanium and technically pure titanium VT1-0 obtained by severe plastic deformation under the scheme of upsetting-extrusion-drawing (iodide titanium) and screw extrusion-drawing (titanium VT1-0) has been examined. It was shown that combination of severe plastic deformation with cryogenic quasi-hydrostatic extrusion allowed to create nanocrystalline titanium of various purity with high strength and plasticity. It is established that, at approximately the same grain sizes, the strength characteristics of technically pure nanotitanium are significantly higher, and the plastic properties are lower than those of iodide nanotitanium.