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1 Advances in Materials Science

1 2007

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Effect of annealing on the transformation and properties of TiNiCo AND TiNiTa shape memory alloys for medical applications

Lekston Z., Goryczka T., Jędrusik-Pawłowska M.

Advances in Materials Science

2007

Vol. 7, nr 3(13)

50-56

Application for medicine of the shape memory alloys required presence of the one- or two-way shape memory effect or superelastic properties, which occur below the patient body temperature. The studied alloys were obtained by induction melting following by hot and cold working. The phase composition and course of the martensitic transformation and their characteristic temperatures of plates and wires, after thermomechanical treatments, were studied using the X-ray diffraction and differential scanning calorymetry (DSC). The B2-B19' and B19'-R-B2 transitions during heating and cooling were observed, respectively. The ageing causes that the martensitic transformation occurs in two steps: B2-R-B19' during cooling as well as heating. Combination of cold working and annealing or quenching with ageing of the semi-products leads to obtain shape memory effect, which occurs in required range of the temperature. The staples and clips with the shape memory effects, which act below the patient body temperature for joining of mandible bone fractures, for in vitro studies, have been prepared.