Reversible axial-strain effect and extended strain limits in Y-Ba-Cu-O coatings on deformation-textured substrates

Cheggour, N.; Ekin, J. W.; Clickner, C. C.; Verebelyi, D.T.; Thieme, C. L. H.; Feenstra, R.; Goyal, A.
November 2003
Applied Physics Letters;11/17/2003, Vol. 83 Issue 20, p4223
Academic Journal
The dependence of transport critical-current density J[sub c] on axial tensile strain [variant_greek_epsilon] was measured at 76 K and self-magnetic field for YBa[sub 2]Cu[sub 3]O[sub 7-δ] (YBCO) coatings on buffered, deformation-textured substrates of pure Ni, Ni–5-at. %-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 J[sub c]([variant_greek_epsilon]) 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. © 2003 American Institute of Physics.


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