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Two-way shape memory effect of TiNi alloy coil extension springs |
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| Authors: | Z. G. Wang X. T. Zu P. Fu J. Y. Dai S. Zhu L. M. Wang |
| Affiliation: | a Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China b International Center for Material Physics, Chinese Academy of Sciences, Shengyang 110015, China c Institute of Electronic Engineering Research, CAEP, P.R. China, Mianyang 621907, China d Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA |
| Abstract: | A two-way shape memory effect (TWSME) spring that could elongate upon heating and contract upon cooling was obtained by constrained annealing and thermo-mechanical training. The effect of heat treatment and thermomechanical training on the TWSME and the effect of training on the transformation temperatures had been studied by elongation-temperature, electrical resistance measurements and differential scanning calorimetry (DSC). The TWSME recovery rate of extension spring increases with increasing the training cycles and increases to a saturation value. The inverse martensitic and martensitic temperatures decreased with increasing thermo-mechanical training cycles. |
| Keywords: | TiNi shape memory alloy Two-way shape memory effect Martensite transformation Thermo-mechanical training |
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