The unique properties of shape memory alloys (their ability to remember their shape, superelasticity, biological compatibility with human organism tissues) allow applying them successfully in medicine for a long time as a perspective material for making implants and different medical devices.

In this given work the results of the pseudoelastic properties investigation of TiNi wire using for medical application are presented. The performed study is aimed on the effect of time and aging temperatures on the transformation temperatures, the width of the transformation hysteresis, and also, on the level of the yield stress and the meaning of the permanent strain by bending deformation of the investigated specimens at the body temperature (i.e. in austenite state). The heat treatment of the wire was realized at the temperature range 250÷550ºС with a number of different heat stages lasting between 15 and 120 minutes. The investigation of the effect of deformation wire cycling on its phase yield stress and the width of hysteresis loop stress-strain was carried out. Also the effect of ultrasonic vibrations on pseudoelastic and deformation properties of the material was studied. The results of the performed researches allowed optimizing the operating practices of the medical products manufacture from TiNi alloys.

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1. Receiving of Bimetallic Joints of TiNi-steel, TiNi-TiNi Using High-Speed Strain
2. The Ultrasound Influence on Pseudoelasticity in TiNi