METHOD OF PRODUCING COPPER ALLOYS WITH SHAPE MEMORY EFFECT Russian patent published in 2025 - IPC C22F1/08 B21J5/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to thermomechanical treatment of polycrystalline copper alloys with shape memory effect with metastable fine-grained (GM) or ultra-fine-grained (UFG) structure capable of undergoing thermoelastic martensitic transformations. Method of deformation-thermal treatment of a workpiece made of copper alloy Cu-14Al-3Ni with a shape memory effect includes heat treatment of the workpiece made of copper alloy and its plastic deformation. Providing workpiece from copper alloy Cu-14Al-3Ni with shape memory effect, which is heated to temperature of 900–1000 °C and forging at this temperature. Subsequent heat treatment by isothermal annealing is carried out at temperature 900–1050 °C with holding at this temperature for 10–30 minutes and subsequent hardening in water with temperature of 20 °C, further heating is carried out to temperature of 400–500 °C and plastic deformation by uniaxial compression with accumulated degree of logarithmic deformation e = 1–2, then, billet is quenched in water at room temperature. Modification of microstructure and properties due to thermal and thermomechanical treatment makes it possible to produce massive items from alloys on the basis of copper for development and manufacture of various volumetric structural elements with shape memory effects for application in various industrial branches.

EFFECT: obtaining articles with high electroconductivity, strength, ductility, as well as sufficient pseudoelastic and high reversible deformation with manifestation of shape memory effect in a wide temperature range.

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