ALPHA + BETA TYPE Ti ALLOY AND PROCESS FOR PRODUCING SAME

摘要

The present invention provides an ±+² type titanium alloy and a production method therefor, which has an ultrafine structure causing superplasticity under low temperatures and has a high deformation ratio compared to conventional ±+² type Ti alloys. The alloy has an ultrafine structure consisting of equiaxial crystals in which an area ratio of crystals having a grain diameter of 1 µm or less is 60 % or more, and maximum frequency grain diameter is 0.5 µm or less, wherein a portion in which the integration degree of plane orientation (0001) of the hexagonal close-packed crystal is 1.00 or more exists within a range of 0 to 60 degrees with respect to a normal line of a processed surface of the alloy.