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The Effect of Annealing and Cold-drawing on the Super-elasticity of the Ni-Ti Shape Memory Alloy Wire

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  • Lei Xu
  • Rui Wang

Abstract

Annealing combined with cold-drawing are the necessary method in the processing of Ni-Ti shape memory alloy thin wires. In this paper, the annealing temperature scan of 450~800?, time scan of 20min~3h and the cold-drawing amount of 6.9%~39% were chosen, and their effects on the thermo and mechanical performance of the Ni-50.5a.t.%Ti alloy wires have been studied. The DSC and tensile-recovery tests were adopted to obtain the phase transformation temperatures and mechanical hysteresis of the Ni-Ti SMA wires with different treatment conditions. The results show that the phase transition temperature of Ni-Ti wire can be changed by varying the annealing temperature and time; cold-drawing deformation and subsequent annealing have a great influence on the super-elasticity. Meanwhile, the surface oxide film and the flake cracks were obtained by SEM scanning. To obtain the best super-elasticity with the maximum cold working amount of 39%, the process with 39% cold drawing amount, 600 ? and 20 min annealing is shown to be effective.

Suggested Citation

  • Lei Xu & Rui Wang, 2010. "The Effect of Annealing and Cold-drawing on the Super-elasticity of the Ni-Ti Shape Memory Alloy Wire," Modern Applied Science, Canadian Center of Science and Education, vol. 4(12), pages 109-109, December.
    • Handle: RePEc:ibn:masjnl:v:4:y:2010:i:12:p:109
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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