Characterization of innovative rotary swaged Cu-Al clad composite wire conductors

• Published in: Materials & design Vol. 160; pp. 828 - 835
• Main Authors: Kocich, Radim, Kunčická, Lenka, Král, Petr, Strunz, Pavel
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15-12-2018; Elsevier
• Subjects: Clad composite; Electrical resistivity; Interfaces; Mechanical properties; Rotary swaging; Scanning electron microscopy; Interfaces; Mechanical properties; Rotary swaging; Scanning electron microscopy; Clad composite; Electrical resistivity
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2018.10.027

Cu/Al composites are perspective for applications in a wide range of industrial and commercial branches, from transportation to elecatrotechnics. This study focuses on Cu/Al clad composite wires with 5 mm in diameter featuring unique sequencing produced via the technology of rotary swaging at the processing temperatures of 20 °C and 250 °C. During the swaging process, we continuously acquired samples for investigations and used our own KOMAFU S600 system for dynamic detection of swaging forces. The composite wires subjected to electrical resistivity measurement were further analysed via electron microscopy, neutron diffraction, and mechanical testing. The results showed that both the total imposed strain (swaging degree) and swaging temperature influenced the investigated parameters non-negligibly. The samples subjected to high reduction ratios (swaging degree > 3) at the temperature of 250 °C exhibited formation of intermetallics at the interfaces, which deteriorated the electric conductivity. However, the conductivity was also affected by structural phenomena, such as work hardening, texture development, dislocations density, and recrystallization. All the final 5 mm samples exhibited sufficient bonding of both the components and recrystallized ultra-fine grained structures providing them with the ultimate tensile strength of >200 MPa.
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•Clad composite wires with 5 mm diameter were produced via rotary swaging.•Composite structures featured ultra-fine grains.•Room temperature swaging induced neglectable intermetallics development.•Work hardening increased ultimate tensile strength to approx. 250 MPa.•Structure restoration and refinement increased electric conductivity.