On the role of pre-existing, unhealed cracks on the bending strain response of Ag-clad (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} tapes

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.118435· OSTI ID:467161

Polak, M; Parrell, J A; Polyanskii, A A; Pashitski, A E; Larbalestier, D C ^[1]

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1. Applied Superconductivity Center, University of Wisconsin, Madison, Wisconsin 53706 (United States)

Studies of the transport critical current (I{sub c}), magnetization, magnetic flux penetration, and microstructure of pressed and rolled Ag-clad (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} tapes (2223) have been made as a function of bending strain. Pressed tapes exhibited markedly less degradation of I{sub c} from strain than did rolled tapes, while the magnetization of pressed tapes declined much more rapidly with bending strain than did either of the transport currents. Magneto-optical imaging of nonbent pressed samples revealed a network of flux-penetrated defect channels that were primarily oriented parallel to the tape axis. Bending such samples to a small strain increased the visibility of these defects, believed to be cracks. This network correlates well to the cracks produced in intermediate thermomechanical processing deformation steps. The greater sensitivity of the transport current of rolled samples to bending is further direct proof of the fact that the tape {open_quotes}remembers{close_quotes} the cracks induced in the core during intermediate deformation and that heat treatment after the deformation does not heal all damage. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 467161
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 70; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
CLADDING
COPPER OXIDES
CRACKS
HIGH-TC SUPERCONDUCTORS
LEAD OXIDES
MAGNETIC FLUX
MAGNETIZATION
MICROSTRUCTURE
SILVER
STRAINS
STRONTIUM OXIDES
SUPERCONDUCTING WIRES
THERMOMECHANICAL TREATMENTS