METHOD OF PRODUCING VOLUME NANOSTRUCTURED SEMI-FINISHED PRODUCTS FROM TITANIUM NICKELIDE-BASED ALLOYS (VERSIONS) Russian patent published in 2020 - IPC C22F1/18 B82Y30/00 B21J5/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely, to production of bars with shape-memory alloy based on titanium nickelide (Ti-Ni), and can be used in production of bulk and long semi-finished products out of alloys based on titanium nickelide with shape memory. Method of obtaining bulk nanostructured rods from alloys with shape memory based on titanium nickelide includes equal-channel angular pressing (ECAP) of the hot-rolled workpiece after quenching in the temperature range of 700–800 °C with cooling in water. Equal-channel angular pressing is performed in a quasi-continuous mode at temperature of 350–450 °C in 5–7 passes with angle of intersection of channels of 110–120°, then performing post-deformation annealing at temperature of 350–450 °C for 1–2 hours. After equal-channel angular pressing, rotary forging can be performed in the temperature range of 350–400 °C with single reduction of 1–15 % to the required final diameter of the workpiece.

EFFECT: improved mechanical and functional properties of Ti-Ni semi-products by forming UFG structure therein: mixed nanocrystalline and nano-absorbed structure after ECAP and after deformation annealing, mixed nanobrain and submicrocrystalline structure after equal-channel angular pressing, rotary forging and post-deformation annealing.

2 cl, 1 tbl, 2 ex