Transformation behavior in rolled NiTi
T. KURITA, H. MATSUMOTO, Hiroshi ABE
Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686
Journal of Alloys and Compounds 381 (2004) 158.
Abstract
The transformation behavior of the equiatomic NiTi alloy cold-worked has been studied by using a differential scanning calorimeter (DSC), in order to reveal the effects of inner stress and defects. The temperature region of the transformation is broadened with increasing cold-working reduction percent, and after subsequent annealing the intermediate phase is formed and enhanced, depending on the annealing temperature. The study on the intermediate phase of cold-rolled NiTi is important for application and essential understanding of the transformation behavior, because the thermal hysteresis of the transformation between the high temperature phase and the intermediate phase is so small in comparison with the one step transformation before cold-working. It is thought that defects play an important role for the newformation of the intermediate phase.
Keywords: Intermediate phase; NiTi; Transformation; Calorimetry
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