METHOD OF PRODUCING BAR FROM TITANIUM-NICKEL ALLOYS WITH SHAPE MEMORY EFFECT Russian patent published in 2024 - IPC C22F1/10 C22F1/18 C22F3/00 B21B3/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to deformation-heat treatment and methods for production of thin bars and wire, having shape memory effect and superelasticity, from alloys of titanium-nickel system, used in aviation, radio electronics, medicine, space engineering, machine building and other engineering fields. Method of producing bar from titanium-nickel alloy with shape memory effect involves plastic deformation of ingot of titanium-nickel alloy in three stages by transverse helical rolling of ingot with production of a workpiece in the form of a bar, multistage rotary forging of the workpiece, subsequent cold rolling or drawing, and then post-deformation annealing of the obtained bar. Multistage rotary forging is carried out to diameter of 6–8 mm with a degree of deformation of 5–25% at each stage with intermediate heating to temperature of 300–500 °C between forging steps for 30–180 minutes, then the obtained bar-shaped workpiece is subjected to cold rolling or drawing to the required diameter using unipolar pulse current with one-time reduction of 50 mcm to achieve accumulated degree of deformation of more than 50%.

EFFECT: creation of specified parameters of structure in alloys up to nanometric range with increased complex of mechanical and functional properties is provided.

4 cl, 1 tbl, 1 ex