Ruslan Zufarovich Valiev,Irina Petrovna Semenova,Evgeniya Borisovna Yakushina,Gulnaz Khalifovna Salimgareeva
申请号：
US13122063
公开号：
US08919168B2
申请日:
2009.10.20
申请国别(地区):
US
年份:
2014
代理人:
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.
