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Infrared Brazing of Ti50Ni50 Shape Memory Alloy and Inconel 600 Alloy with Two Ag-Cu-Ti Active Braze Alloys

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Abstract

Infrared brazing of Ti50Ni50 SMA and Inconel 600 alloy using Cusil-ABA and Ticusil filler metals has been investigated. The joints were dominated by Ag-Cu eutectic with proeutectic Cu in the Cusil-ABA brazed joint and with proeutectic Ag in the Ticusil one. A continuous curved belt composed of a Ni3Ti layer and a (Cu x Ni1−x )2Ti layer formed in the brazed Ti50Ni50/Ticusil/Inconel 600 joint. On the Ti50Ni50 SMA side, an intermetallic layer of (Cu x Ni1−x )2Ti formed in all joints, with x values around 0.81 and 0.47. Layers of (Cu x Ni1−x )2Ti, Ni3Ti, and mixed Ni3Ti and Ni2Cr intermetallics were observed next to the Inconel 600 substrate in the brazed Ti50Ni50/Cusil-ABA/Inconel 600 joint. The maximum shear strengths of the joints using the Cusil-ABA filler metal and the Ticusil filler metal were 324 and 300 MPa, respectively. In the Cusil-ABA brazed joint, cracks with cleavage-dominated fracture propagated along the (Cu x Ni1−x )2Ti interfacial layer next to the Ti50Ni50 SMA substrate. In the Ticusil brazed joint, ductile dimple fracture occurred in the Ag-rich matrix near the Inconel 600 alloy substrate. The absence of a detrimental Ti-Fe-(Cu) layer on the Inconel 600 substrate side can effectively improve the shear strength of the joint.

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Acknowledgments

The authors gratefully acknowledge the financial support for this research provided by the Ministry of Science and Technology (MOST) and National Taiwan University (NTU), Taiwan, under Grant Nos. MOST 104-2221-E002-005 and NTU 105R891803.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan, ROC

    Ren-Kae Shiue & Shyi-Kaan Wu

  2. Department of Mechanical Engineering, National Taiwan University, Taipei, 106, Taiwan, ROC

    Shyi-Kaan Wu & Sheng-Hao Yang

Authors
  1. Ren-Kae Shiue
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  2. Shyi-Kaan Wu
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  3. Sheng-Hao Yang
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Correspondence to Shyi-Kaan Wu.

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Manuscript submitted February 26, 2016.

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Shiue, RK., Wu, SK. & Yang, SH. Infrared Brazing of Ti50Ni50 Shape Memory Alloy and Inconel 600 Alloy with Two Ag-Cu-Ti Active Braze Alloys. Metall Mater Trans A 48, 735–744 (2017). https://doi.org/10.1007/s11661-016-3890-z

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