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Microstructure, Cyclic Deformation and Corrosion Behavior of Laser Welded NiTi Shape Memory Wires

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Abstract

The present paper reports the effects of Nd:YAG laser welding on the microstructure, phase transformation, cyclic deformation behavior, and corrosion resistance of Ti-55 wt.% Ni wire. The results showed that the laser welding altered the microstructure of the weld metal which mainly composed of columnar dendrites grown epitaxially from the fusion line. DSC results indicated that the onset of the transformation temperatures of the weld metal differed from that of the base metal. Cyclic stress-strain behavior of laser-welded NiTi wire was comparable to the as-received material; while a little reduction in the pseudo-elastic property was noted. The weld metal exhibited higher corrosion potential, lower corrosion current density, higher breakdown potential and wider passive region than the base metal. The weld metal was therefore more resistant to corrosion than the base metal.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, 84156-83111, Esfahān, Iran

    G. R. Mirshekari, A. Kermanpur, A. Saatchi & A. P. Soleymani

  2. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA

    A. Saatchi

  3. Department of Materials Science and Engineering, Sharif University of Technology, 11365-9466, Tehran, Iran

    S. K. Sadrnezhaad

Authors
  1. G. R. Mirshekari
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  2. A. Kermanpur
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  3. A. Saatchi
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  4. S. K. Sadrnezhaad
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  5. A. P. Soleymani
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Correspondence to G. R. Mirshekari.

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Mirshekari, G.R., Kermanpur, A., Saatchi, A. et al. Microstructure, Cyclic Deformation and Corrosion Behavior of Laser Welded NiTi Shape Memory Wires. J. of Materi Eng and Perform 24, 3356–3364 (2015). https://doi.org/10.1007/s11665-015-1614-y

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  • DOI: https://doi.org/10.1007/s11665-015-1614-y

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