Abstract
The paper reports creep data of a Ni-rich NiTi-alloy at stresses and temperatures in the range of 500 °C and 150 MPa. The apparent activation energy for creep and the creep stress exponent were found to be 421 kJ/mole and 5. Tempering and pre-creep result in a 20°C increase of phase transformation temperatures (PTTs). The effect of an additional plastic deformation (as compared to a stress free aging treatment) is that PTT-peaks broaden and overlap on cooling and broaden on heating. This can only be rationalized on the basis of a difference in microstructures between the tempered and pre-crept materials.
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