Axial strain dependence at 77 K of the critical current of thick YBaCuO films on Ni-alloy substrates with IBAD buffer layers

Thieme, C.L.H.; Fleshler, E.; Buczek, D.; Jowett, M.; Fritzemeier, Les; Arendt, P. N.; Foltyn, S. R.; Coulter, J. Y.; Willis, J.O.

doi:10.1109/77.784676

Cited by 23 publications

(14 citation statements)

References 8 publications

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“…This contrasts with, but does not contradict, data obtained for YBCO films coated on buffered Inconel-625 substrates using ion-beamassisted deposition, in which the two strains were about the same (ϳ0.35%, similar to our results for YBCO on Ni-alloy RABiTS͒. 10 We suggest that there exists a critical strain c at which YBCO fractures that is coincidentally close to the greater value of p of Inconel-625. For substrates in which p Ͻ c , substrate yielding does not induce YBCO cracking so long as local strain remains smaller than c throughout the entire YBCO/buffers/substrate interfaces.…”

contrasting

confidence: 78%

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

Cheggour

Ekin

Clickner

et al. 2003

Applied Physics Letters

128

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The dependence of transport critical-current density J c on axial tensile strain was measured at 76 K and self-magnetic field for YBa 2 Cu 3 O 7Ϫ␦ ͑YBCO͒ 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 c () 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.

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contrasting

confidence: 78%

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

Cheggour

Ekin

Clickner

et al. 2003

Applied Physics Letters

128

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“…On the other hand, a YBCO coated tape is expected to be a next generation high performance superconductor; the mechanical properties of the tape has nevertheless not been measured at many laboratories. The stress-strain data of tensile direction of the YBCO tape was already obtained [7], [8]. On the other hand, the data of bending and torsion of the tape has hardly obtained.…”

Section: Introductionmentioning

confidence: 98%

Influence of Bending and Torsion Strains on Critical Currents in YBCO Coated Conductors

Takao

Iwamura

Fukasawa

et al. 2007

IEEE Trans. Appl. Supercond.

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A YBCO coated conductor is expected to be a next generation high performance superconductor. To design superconducting machines using YBCO conductors, evaluation of not only superconducting properties but also mechanical properties is very important. Hence, we applied bending and torsion to the YBCO conductor and measured degradation of the conductor against the strain. To compare with the YBCO's data, a Bi2223 conductor was also tested under the same experimental condition. From the bending test, degradation of the Bi conductor was faster than that of the YBCO conductor and the critical current gradually decreased with increasing bending strain. The YBCO conductor kept better performance than the Bi conductor, and degradation suddenly occurred. And when the superconducting layer in the YBCO conductor was subjected to compressive strain in the bending test, the critical current hardly decreased at approximately one percent of the bending strain.

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“…However, much estimation of the strength is in a tensile direction of the tape [3], [4]. The strength in a compressive direction has been little evaluated.…”

Section: Influence Of Compressive Length Of Normal Stress Onmentioning

confidence: 99%

Influence of Compressive Length of Normal Stress on Degradation in Bi-2223 Tapes

Takao

Ito

Umekawa

et al. 2005

IEEE Trans. Appl. Supercond.

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We have applied transversal-compressive force to typical Bi-2223 tapes with multi-filaments and a Ag-alloy matrix. The degradation of superconducting performance of the tapes against the compressive force was measured. In the experiment, damaged lengths along the tape were changed, and hence, the dependence of the damaged lengths on the degradation were also evaluated. According to the experimental results, in spite of the same stress to the tapes, the degradation clearly depended on the loaded length along the tape. Therefore, the superconducting property degraded with increasing of the damaged length. When the transversal-compressive force is applied to the tape surfaces, it should be carefully noted that the degradation depends on the damaged length along the tape.

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Axial strain dependence at 77 K of the critical current of thick YBaCuO films on Ni-alloy substrates with IBAD buffer layers

Cited by 23 publications

References 8 publications

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

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

Influence of Bending and Torsion Strains on Critical Currents in YBCO Coated Conductors

Influence of Compressive Length of Normal Stress on Degradation in Bi-2223 Tapes

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