The influence of the crystallographic texture and phase composition of Ti-Nb-Zr alloys with shape memory and superelasticity on their functional properties

Currently, Ti-Zr-Nb-based biocompatible alloys are considered as prospective for medical applications. In this work, the mechanisms of the formation of the crystallographic texture of five alloys Ti-(17-19)Zr-(14-16)Nb (at.%) have been compared. The presence of martensitic transformations during the rolling process determines the features of the formed texture. At the initial stage of deformation (ε = 50%), the texture {112}<011> is formed in all five alloys. With an increase of the degree of deformation to 92%, the texture dissipates somewhat, which is due to an increase in the fraction of the martensitic phase in the foils. Recrystallization of rolled foils (ε = 92%) at 650°C leads to an exacerbation of the texture component close to {100}<011>, the blurring of which varies in different alloys. Cyclic tensile tests along three directions: the rolling direction (RD), the transverse direction, at an angle of 45° to the RD showed the presence of anisotropy in the samples. It was shown, that the effect of superelasticity is orientation-and structure-depending, and the anisotropy of mechanical properties.