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The optimization of annealing and cold-drawing in the manufacture of the Ni–Ti shape memory alloy ultra-thin wire

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Abstract

In this paper, the mechanical properties of the Ni–50.5 at.%–Ti alloy super-elastic wires manufactured by a conditioned multi-passed process of annealing and cold-drawing have been studied. The annealing temperature of 450~800°C, time of 20 min~3 h and the cold-drawing amount of 6.9%~39% were chosen. Their effects on the thermo, mechanical, and surface morphology of the Ni–Ti wires have been studied. The differential scanning calorimetry 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. The process with 39% cold-drawing amount, 600°C and 20 min annealing is shown to be effective in the manufacturing.

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Authors and Affiliations

  1. Key laboratory of Advanced Composites, Ministry of Education, Tianjin, 300160, China

    Xu Lei, Wang Rui & Liu Yong

  2. College of Material Science and Engineering, Tianjin Polytechnic University, Tianjin, 300160, China

    Xu Lei

Authors
  1. Xu Lei
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  2. Wang Rui
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  3. Liu Yong
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Correspondence to Wang Rui.

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Lei, X., Rui, W. & Yong, L. The optimization of annealing and cold-drawing in the manufacture of the Ni–Ti shape memory alloy ultra-thin wire. Int J Adv Manuf Technol 55, 905–910 (2011). https://doi.org/10.1007/s00170-010-3116-2

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  • DOI: https://doi.org/10.1007/s00170-010-3116-2

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