Fabrication of 6-filament MgB sub(2) wires enhanced by high strength 91-filament Cu-Nb composite

• Published in: Journal of materials science. Materials in electronics 2013-04, Vol.24 (4), p.1250-1255
• Main Authors: Sun, Yu Yan, Zhang, Ping Xiang, Sulpice, Andre, Mossang, Eric, Liang, Ming, Yan, Guo
• Format: Article
• Language: English
• Subjects: Borides; COMPOSITES; Copper; Core wire; CURRENT DENSITY; FABRICATION; Ferromagnetic materials; High strength; MAGNESIUM COMPOUNDS; MECHANICAL PROPERTIES; PROPERTIES; WIRE
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-012-0915-2

We chose high strength and high conductive Cu-Nb composite as strengthening core to improve the mechanical properties of 6-filament MgB sub(2) wires. The Cu-Nb core become partially dispersion strengthened during the fabrications of the MgB sub(2) wires. It has been found that this Cu-Nb composite offers good promise of increased strength while maintaining the superconducting properties of the MgB sub(2) wire. The Young's modulus of the best wire samples increased significantly to about 130 GPa, which is comparable to those of high strength ferromagnetic materials sheathed wires but without negative ferromagnetic effects. Those mechanical properties were enough to satisfy the low field application needs. The critical current I sub(c) also achieves 200 A (engineering critical current density, J sub(ce) above 1.30 10 super(4) A /cm super(2)) at 20 K 1 T field. The 91-filament Cu-Nb composite core reinforced wires were fabricated by in situ Powder In Tube method.