Abstract
Two-way shape memory effect (TWSME) was introduced in a narrow hysteresis TiNiCu shape memory alloy spring by thermomechanical training after a constrained annealing heat treatment. A TWSME extension spring that can extend while heating and contract while cooling using the TiNiCu shape memory alloy was obtained. The result showed that the TWSME recovery rate of the extension spring could be high—up to 58% when thermomechanical training reached 225 cycles after annealing on the constrained condition at 500 °C for 1 h. The TWSME recovery rate still maintains 42% when it was thermally cycled 1100 times. The effect of different heat treatment conditions on TWSME of the springs was also researched. The transformation temperatures and hysteresis were studied by differential scanning calorimetry (DSC) during training transformation.
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