Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||Najib Cheggour; John (Jack) W. Ekin; Cameron C. Clickner; D. T. Verebelyi; C. L. H. Thieme; Ron Feenstra; P Goyal;|
|Title:||Reversible axial-strain effect and extended strain limits in Y-Ba-Cu-O coatings on deformation-textured substrates|
|Published:||November 17, 2003|
|Abstract:||The dependence of transport critical-current density (Jc) on axial tensile strain (ε) was measured at 76 K and self-magnetic field for YBa2Cu3O7-δ (YBCO) coatings on buffered, deformation-textured substrates of pure Ni, Ni-5at.%-W, and Ni-10-at.%Cr-2-at.%-W. Expectations have been that the strain tolerance of these composites would be limited by the relatively low yield strains of the deformation-textured substrates, typically less than 0.2 %. However, results show that the irreversible degradation of Jcε occurs at a strain equal to about twice the yield strain of the substrate. Therefore, YBCO/Ni-alloy composites may satisfy axial-strain performance requirements for electric devices, including the most demanding applications, motors and generators in which a strain tolerance exceeding 0.25 % is needed. Furthermore, the YBCO/Ni-5-at.%-W conductors showed a reversible strain effect, which may be induced by a reversible strain-field broadening around mismatch dislocations at the grain boundaries. This effect may contribute to the unexpectedly large usable strain range of these conductors.|
|Citation:||Applied Physics Letters|
|Pages:||pp. 4223 - 4225|
|Keywords:||coated conductors,critical current density,elastic strain,mechanical properties,microstructure,reversibility,strain,stress,superconductors|
|PDF version:||Click here to retrieve PDF version of paper (95KB)|