Commercially pure titanium nanoestruturado for biomedicine and method of manufacture of commercially pure titanium rods

摘要

Commercially pure titanium having UFG structure and enhanced mechanical and biomedical characteristics has nanocrystalline alpha-phase grains with a hexagonal close-packed lattice, in which the share of grains with a size of 0.1...0.5 µm and a grain shape coefficient of no more than 2 in the mutually perpendicular planes makes no less than 90%, over 60% of the grains having high-angle boundaries disoriented in relation to the adjacent grains by the angles from 15 to 90°. The method for making a rod of the material provides for equal-channel angular pressing_of a billet at T ‰¤ 450°C with the total accumulated true strain e ‰¥ 4 to effect severe plastic deformation of the billet and subsequent thermomechanical treatment with a gradual decrease of the temperature in the range of 450...350°C and the strain rate of 10 -2 ...10 -4 s -1 with the strain degree from 40 to 80% to effect additional plastic deformation.