The effect of heat treatment on the static mechanical properties of a Ti-20Nb-10Ta shape memory alloy in the form of thin wire is studied. After annealing at 600 °C for 20 minutes, a low modulus of elasticity was obtained. The best strength and ductility indicators were obtained after annealing at a temperature of 800 °C during 60 minutes.
Research of dynamics of nonlinear corrosion processes of non-nickel titanium shape memory alloy Ti-20Nb-10Ta is performed. Samples were placed in mediums imitating physiological liquids, with ðÍ from 1.68 to 9.18. 3 types of samples were used: in an initial state, after thermal (annealing) and surface mechanical treatment. After annealing, there is a slight narrowing of the X-ray peaks, which indicates stress relief. New phases are not allocated. The alloy is a substitution solution with a b-Ti lattice. The greatest release of titanium ions was observed in solution with the sourest environment and samples after annealing. Release of niobium and tantalum ions in solution with any acidity was not observed.
Biocompatibility of a Ti-(20-30) Nb-5Zr shape memory alloy was studied in vitro in standard cell medium. The number of cells, the mitotic index, the number of dead cells were estimated. All samples were biocompatible in vitro. Mitochondrial activity and good cell survival were observed. The Ti-28Nb-5Zr alloy has the best characteristics.
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