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Microstructure and Strength of NiTi-Nb Eutectic Braze Joining NiTi Wires

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Abstract

NiTi wires were brazed together via liquid eutectic formation between NiTi and Nb powders deposited at the wire contact region. The brazed region shows proeutectic NiTi(Nb) in contact with the wires, sandwiching a NiTi-Nb eutectic structure, whose microhardness and stiffness, as characterized via nanoindentation, are higher than the NiTi wires, while also showing signs of high ductility. NiTi-Nb eutectic bonding may thus be a viable approach for producing shape-memory NiTi scaffolds brazed from stacked, woven, or braided wires.

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This research was supported by DARPA under the Grant W91CRB1010004. National Science Foundation under Grant No: 51302168 of China. The authors gratefully acknowledge experimental hardness measurements by Dr. Lechun Xie from Shanghai Jiao Tong University.

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Author notes

  1. Cong Wang (Professor)

    Present address: School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, P.R. China

Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    Liqiang Wang (Associate Professor)

  2. Department of Materials Science & Engineering, Northwestern University, Evanston, IL, 60208, USA

    Liqiang Wang (Associate Professor), Cong Wang (Professor) & David C. Dunand (Professor)

Authors
  1. Liqiang Wang
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  2. Cong Wang
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  3. David C. Dunand
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Corresponding authors

Correspondence to Liqiang Wang or David C. Dunand.

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Manuscript submitted March 13, 2014.

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Wang, L., Wang, C. & Dunand, D.C. Microstructure and Strength of NiTi-Nb Eutectic Braze Joining NiTi Wires. Metall Mater Trans A 46, 1433–1436 (2015). https://doi.org/10.1007/s11661-015-2781-z

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