TREATMENT METHOD OF TITANIUM-NICKEL ALLOYS WITH NICKEL CONTENT OF 49-51 AT % WITH SHAPE MEMORY EFFECT AND REVERSIBLE SHAPE MEMORY EFFECT (VERSIONS) Russian patent published in 2013 - IPC C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention is related to the treatment method of titanium-nickel alloys with nickel content of 49-51 at % with shape memory effect and reversible shape memory effect (versions). The above method involves thermomechanical treatment combining deformation and annealing after deformation in the temperature range of 350-500°C till the accumulated deformation degree of 25-40% annealing after deformation in the temperature range of 350-500°C is obtained; thermomechanical guiding of shape memory effect (SME) and reversible shape memory effect (RSME) the annealing after deformation is performed during 1.5-10 h, and guiding of SME and RSME is performed by means of loading of the alloy as per the bending pattern with deformation of 12-20% at temperature A_k -10 ≤ T ≤ A_k +10, exposure at that temperature during 0.25-5 minutes, cooling to the end temperature of martensitic transformation; after that, alloy is unloaded and thermally cycled in the temperature range of A_k to -196°C with exposures during 0.25-5 minutes. According to the second version of the method, after the deformation is completed, first, recrystallisation annealing is performed at the temperature of 700°C during 0.20-120 minutes, and then, annealing after deformation is performed.

EFFECT: improving functional properties of the alloy.

2 cl, 1 dwg, 3 ex