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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...
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