from the conferences organized by TANGER Ltd.
The aim of this work was to study the influence of thermal treatment of the NiTi alloy on the microstructure, fracture features, and phase composition. NiTi sheets with a thickness of 2 mm and a chemical composition of 56.3 wt% Ni and 43.7 wt% Ti were used for the experiment. The samples were subjected to solution treatment at 850 °C for 1 hour and subsequent aging at 450 °C for 1 hour, or only aging at the same temperature and time for the as-received state of the material. All steps were finished by water quenching. Experiments were carried out for four states of the samples, namely the as-received state, after solution treatment, solution treatment and aging, and only aging. The study of the microstructure was carried out using a transmission electron microscope. The samples were tensile tested at a strain rate of 6.67·10-5 s-1 and the fracture surfaces were examined using a scanning electron microscope. Phase composition was estimated using XRD analysis.
Keywords: NiTi, thermal treatment, fracture, TEM, XRD© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.