Abstract
This paper experimentally analyzes the influence of repeated thermal cycling at zero stress on the two-way training efficiency for developing the two-way shape memory effect in TiNi shape memory alloys. Four different sets of TiNi wire are used in the study: two sets have been heat-treated to ensure a transformation path with no R-phase, whereas the other two sets have had the same heat-treatment which is then followed by repeated thermal cycling at zero stress to stabilize their phase transformation behavior. Subsequently, thermal cycling under constant stress two-way training is performed on each sample set. The study then analyzes the training efficiency and the recoverable two-way memory strain for each sample set. The results suggest that to obtain the best two-way material performance, that is, to obtain a substantial two way memory strain together with an increase in the efficiency of the training, the TiNi wire should be thermally cycled at zero stress prior to training until the phase transformation is stabilized.
Published Version
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