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Appl. Sci. 2018, 8(6), 985; https://doi.org/10.3390/app8060985

Self-Powered Fast Brazing of Ti-6Al-4V Using Ni/Al Reactive Multilayer Films

1
Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, 1512 Middle Drive, Knoxville, TN 37996, USA
2
Center for Nanophase Material Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
3
Composite Solutions and Digital Manufacturing LLC, 3315 S. Waterfront Dr, Chandler, AZ 85248, USA
4
Jet Propulsion Laboratory (JPL), California Institute of Technology, M.S. 67-119, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
*
Author to whom correspondence should be addressed.
Received: 26 May 2018 / Revised: 8 June 2018 / Accepted: 12 June 2018 / Published: 15 June 2018
(This article belongs to the Special Issue Selected Papers from the NMJ2018)
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Abstract

Self-powered brazing of Ti-6Al-4V was performed using Ni/Al reactive multilayer films (RMFs) as self-propagated heat resources. BAlSi-4 was first coated on Ti-6Al-4V by plasma welding, then alternating layers of Ni and Al were successfully deposited on BAlSi-4 up to 32.9 μm thick with e-beam deposition. The joint microstructure was investigated and the AlNi and Ni5Al3 phases were identified in the RMF. The cause for the two phases was determined to be differences in the diffusivity of Ni and Al, ultrafast brazing time, and faster cooling at the interface between brazing filler metal and the RMF. The maximum temperature of 683 °C was reached in the brazed joint, with a total RMF thickness of 135 μm, which is more than sufficient to melt the BAlSi-4 brazing material. The maximum bonding strength obtained was 10.6 MPa, with a self-power brazing procedure conducted in a minute. It is possible to further improve the bonding strength by using more ductile RMFs and/or modifying the bonding interface configuration. View Full-Text
Keywords: brazing; reactive bonding; self-powered; titanium; nanolayers; reactive multilayer brazing; reactive bonding; self-powered; titanium; nanolayers; reactive multilayer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Bridges, D.; Rouleau, C.; Gosser, Z.; Smith, C.; Zhang, Z.; Hong, K.; Cheng, J.; Bar-Cohen, Y.; Hu, A. Self-Powered Fast Brazing of Ti-6Al-4V Using Ni/Al Reactive Multilayer Films. Appl. Sci. 2018, 8, 985.

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