METHOD OF PRODUCTION OF ULTRA-FINE-GRAINED TITANIUM-NICKEL ALLOYS OF MEMORIZED-SHAPE EFFECT Russian patent published in 2005 - IPC

FIELD: metallurgy; deformation and thermal treatment of memorized-shape effect titanium-nickel alloys; mechanical engineering; medicine.

SUBSTANCE: proposed method includes thermal and mechanical treatment including deformation and before-crystallization annealing. Prior to thermal and mechanical treatment, alloy is subjected to preliminary hardening. Deformation is performed at two stages: at first stage intensive plastic deformation is performed at accumulated true degree of deformation e≥ 4 within temperature range of 300-550°C; at second stage, deformation is performed by rolling, extrusion or drawing at degree of deformation no less than 20% and temperature of 20-500°C; annealing is performed at temperature of 350-550°C continued for 0.5-2.0 h.

EFFECT: improved mechanical properties at increased functional properties due to forming ultra-fine-grained structure.

6 cl, 1 tbl, 1 ex