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Properties of high strength Cu-Nb conductor for pulsed magnet applications

2002; IEEE Council on Superconductivity; Volume: 12; Issue: 1 Linguagem: Inglês

10.1109/tasc.2002.1018611

1558-2515

Ke Han, V. J. Toplosky, R. P. Walsh, Charles A. Swenson, B. Lesch, V. I. Pantsyrnyi,

Metal and Thin Film Mechanics

Various tests have been undertaken to study the effects of annealing, testing temperatures and volume fraction of the Cu cladding on the properties of Cu-Nb conductors being developed for pulsed magnet applications. The results demonstrate that short time annealing used for insulation had no significant effect on the tensile property of Cu-Nb conductors. The cryogenic temperatures are beneficial to both the conductivity and mechanical properties of the conductors, especially the tensile strength of the Cu cladding. The wire-drawing fabrications showed that wires of 4 mm/spl times/6 mm cross-section-area with a significant volume fraction of Cu cladding could be obtained, leading to final tensile strengths of up to 1100 MPa at room temperature. The strength is increased by about 20% at 77 K. The 77 K-conductivity is about 4.5 times of the room temperature one. The strengthening mechanisms and resistivity variation of the Cu-Nb composite are discussed and it is argued that the distance between the Nb ribbons plays an important role in the variation of these properties.