NiTi Wire Alloy

Alloy name: NiTi wire
Diagram No.: 870
Type of diagram: TTT
Chemical composition in weight %: 50.8% Ni, balance is Ti
Alloy group: Nickel-based alloys
Note: Conventional time–temperature–transformation (TTT) diagram for NiTi wire with initial Af = 11 C [31]. The data from Figure are re-plotted to illustrate the conventional time–temperature–transformation (TTT) diagram. Note that the maximum precipitation rate is about 400°C. Between 500°C and 550°C the precipitates dissolve and tend to lower the Af. A new precipitate forms at 550°C.
Fig. depicts the effect of aging temperature and time on the phase transformation of Ti–50.8% Ni wire with an initial Af temperature of 11 .C. To achieve the balance between driving force and diffusion rate required for phase transformation, for all curves with different Af temperatures, the maximum precipitation rate occurs at about 400 C, which is the best temperature for aging. On the other hand, the higher Af temperature, the wider the area of temperature hysteresis between austenite and martensite phases. Based on this fact, it is possible to obtain totally martensite microstructure in samples with high Af temperatures easier and in lower cooling rates. Nevertheless, above 500 C, higher diffusion rate takes place and therefore the time required for transformation to be finished decreases.
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