METHOD OF THERMOMECHANICAL TREATMENT OF ALLOYS BASED ON TITANIUM NICKELIDE FOR REALIZATION OF SHAPE MEMORY EFFECT Russian patent published in 2020 - IPC C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to thermomechanical treatment of titanium nickelide and can be used in preparation of alloys to obtain stable value of reversible deformation resource in products of power element type used in automation or medical devices. Method for determining reversible deformation of titanium nickelide-based alloy includes thermomechanical treatment by carrying out a cycle of thermoelastic martensitic transformations, in which alloy is heated and cooled in temperature range containing conversion interval under conditions of mechanical load, and determining the value of accumulated and reversible deformations, carrying out a series of cycles of thermoelastic martensitic transformations at different loads in the cycle and determining values of reversible and residual deformations of saturation, plotting dependence of values of reversible and residual deformations of saturation on load and determining critical load, and then determining optimum value of reversible deformation at mechanical load, not exceeding critical.

EFFECT: higher stability of reversible deformation in alloys based on titanium nickelide, undergoing thermoelastic martensitic transformations, by fixing deformation modes and detection of critical mechanical load determining maximum accumulation and return of reversible (martensite) deformation, exceeding of which reduces reversible deformation resource up to zero.

1 cl, 5 ex, 6 dwg