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Article

Mechanical and Microstructural Characterization of Ultrasonic Welded NiTiCu Shape Memory Alloy Wires to Silver-Coated Copper Ferrules

1
Chair of Composites and Material Compounds, Institute of Materials Science and Engineering, Chemnitz University of Technology, 09125 Chemnitz, Germany
2
Fraunhofer Institute for Machine Tools and Forming Technology IWU, 01187 Dresden, Germany
*
Author to whom correspondence should be addressed.
Metals 2021, 11(12), 1936; https://doi.org/10.3390/met11121936
Received: 27 October 2021 / Revised: 16 November 2021 / Accepted: 24 November 2021 / Published: 30 November 2021
The aim of this study was to investigate the mechanical behavior, and the microstructure of NiTiCu shape memory alloy wires joined with silver-coated copper ferrules via ultrasonic spot welding. Therefore, the electrical resistance was measured during tensile testing, and the joints were analyzed by scanning electron microscopy. Energy-dispersive X-ray spectroscopy has determined the compounds of the developed welding zones. Furthermore, the influence of the ultrasonic welding on the transition temperatures of the NiTiCu wires was examined via differential scanning calorimetry. Tensile tests have shown that the ultimate tensile strengths of the joints reached almost 100% of that of the base material. An additional heat treatment rebuilt the typical shape memory alloy behavior after the ultrasonic welding process detwinned the martensitic wires. In addition, the B19′ structure of the welding zone and the ultrasonic spot-welding process did not affect the transition temperatures of the shape memory alloy. View Full-Text
Keywords: ultrasonic metal welding; shape memory alloys; mechanical and microstructural properties; transition temperature ultrasonic metal welding; shape memory alloys; mechanical and microstructural properties; transition temperature
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MDPI and ACS Style

Sprigode, T.; Gester, A.; Wagner, G.; Mäder, T.; Senf, B.; Drossel, W.-G. Mechanical and Microstructural Characterization of Ultrasonic Welded NiTiCu Shape Memory Alloy Wires to Silver-Coated Copper Ferrules. Metals 2021, 11, 1936. https://doi.org/10.3390/met11121936

AMA Style

Sprigode T, Gester A, Wagner G, Mäder T, Senf B, Drossel W-G. Mechanical and Microstructural Characterization of Ultrasonic Welded NiTiCu Shape Memory Alloy Wires to Silver-Coated Copper Ferrules. Metals. 2021; 11(12):1936. https://doi.org/10.3390/met11121936

Chicago/Turabian Style

Sprigode, Toni, Andreas Gester, Guntram Wagner, Thomas Mäder, Björn Senf, and Welf-Guntram Drossel. 2021. "Mechanical and Microstructural Characterization of Ultrasonic Welded NiTiCu Shape Memory Alloy Wires to Silver-Coated Copper Ferrules" Metals 11, no. 12: 1936. https://doi.org/10.3390/met11121936

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