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Publication Citation: Mechanical properties of pure Ni and Ni-alloy substrate materials for Y-Ba-Cu-O coated suprconductors

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Author(s): Cameron C. Clickner; John (Jack) W. Ekin; Najib Cheggour; C. L. H. Thieme; You-Lin Qiao; Y Y. Xie; P Goyal;
Title: Mechanical properties of pure Ni and Ni-alloy substrate materials for Y-Ba-Cu-O coated suprconductors
Published: January 04, 2006
Abstract: Mechanical properties of rolling-assisted, biaxially-textured substrates (RABiTS) and substrates for ion-beam assisted deposition (IBAD) coated superconductors are measured at room temperature, 76, and 4 K. Yield strength, Young's modulus, and the proportional limit of elasticity are determined, tabulated and compared. Results obtained are intended to serve as a database of mechanical properties of substrates having the same anneal state and texture as those incorporated in the general class of RE-Ba-Cu-O coated conductor composites (RE = rare earth). The RABiTS materials measured are pure Ni, Ni-13at.%Cr, Ni-3at.%W-2at.%Fe, Ni-10at.%Cr-2at.%W, and Ni-5at.%W. The IBAD substrate materials included Inconel 625 and Hastelloy C-276. The Ni alloys are substantially stronger and show higher strains at the proportional limit than those of pure Ni. Substrates fully coated with buffer layers, ~1 υm of Y-Ba-Cu-O, and 3-5 υm of Ag have similar mechanical properties (at 76 K) as the substrate alone. Somewhat surprisingly, plating an additional 30-40 υm of Cu stabilizer onto high-yield-strength (690 MPa) Hastelloy coated conductors ~100 υm thick, reduces the overall yield strength of the composite structure by only about 10-12% at 76 K and 12-14% at room temperature; this indicates that the Cu layer, despite its relatively soft nature, contributes significantly to the overall strength of even high-strength coated conductors.
Citation: Cryogenics
Volume: 46
Pages: pp. 432 - 438
Keywords: composit conductors (A),high-Tc superconductors (A),mechanical properties (C),superconducting cables (A)
Research Areas: Electromagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (166KB)