Magneto-optical images of Ag/Bi-2223 tapes processed by flat rolling, "sandwich" rolling and pressing

Magneto-optical imaging (MOI) has been used for study Ag/Bi-2223 tapes processed using flat rolling, "sandwich" rolling, and pressing methods for the intermediate mechanical deformation in powder-in-tube process. The results show that not only the density of the microcracks but also their...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1), p.3764-3767
Main Authors: Liu, H.K., Polyanskii, A., Chen, W.M., Guo, Y.C., Dou, S.X., Apperley, M.
Format: Article
Language:English
Subjects:
Applied sciences
Australia Council
Conductors
Current distribution
DENSITY
Electrical engineering. Electrical power engineering
Exact sciences and technology
Materials
Microcracks
Multifilamentary superconductors
Physics
Postal services
Pressing
REDUCTION
ROLLING
Sandwich rolling
Silver
Superconducting materials
Superconducting tapes
Superconductivity
SUPERCONDUCTORS
TAPE
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Summary:Magneto-optical imaging (MOI) has been used for study Ag/Bi-2223 tapes processed using flat rolling, "sandwich" rolling, and pressing methods for the intermediate mechanical deformation in powder-in-tube process. The results show that not only the density of the microcracks but also their distribution affect J/sub c/. Rolled tapes have a higher density of microcracks than pressed tapes. Although the flat rolled tape and "sandwich" rolled tape have the same level density of microcracks at the same reduction, the cracks in the former are more in the transverse direction than in the latter. In all three cases, J/sub c/ reaches a maximum value at an optimal reduction rate.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.919883