METAL NANOSTRUCTURED ALLOY BASED ON TITANIUM, AND METHOD FOR ITS TREATMENT Russian patent published in 2013 - IPC C22C14/00 A61L27/00 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: alloy based on titanium with shape memory effect for bone implants and method for its treatment are proposed. Alloy contains the following, wt %: Ti 71.0-74.0, Nb 19.0-23.0, Ta and/or Zr 4.0-9.0. At room temperature the alloy has nano-sized structure consisting of cubic metastable β-phase, orthorhombic α"-martensite, hexagonal ω-phase and hexagonal α'-martensite, and alloy elasticity modulus does not exceed 25 GPa. Alloy treatment method involves hot pressure shaping of an alloy ingot based on titanium at initial temperature of 900-950°C and final temperature of 700-750°C, thermomechanical treatment by multi-pass cold deformation with total degree of reduction of 31 to 99%, annealing after deformation at the temperature of 500-600°C and final quenching in water. Then, mechanical pseudoelastic cycling of the obtained workpiece is performed under conditions of single-axis tension till 2% of deformation is achieved during 50-100 cycles and removal of load.

EFFECT: alloy has long-term service life of bone implants due to low elasticity modulus close as to the value to bone tissue and pseudoelasticity effect.

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