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Strain Dependent Transport and Mechanical Characteristics of High-current and High-Strength Type Ag/Bi2223 Composite Superconductors

Published online by Cambridge University Press:  01 February 2011

Malik Idries Adam  and
Kozo Osamura
Malik Idries Adam
Affiliation:
mdries@hotmail.com, UTP, Malaysia, Electrical and Electronic Engineering, Tronoh, Perak, Bandar Seri Iskandar, Perak, 31750, Malaysia, +605-368-7686, +605-365-5905
Kozo Osamura
Affiliation:
kozo.osamura@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Sakyo-Ku, Kyoto, Kyoto, 606-8501, Japan
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Abstract

Tensile strain dependence of electromechanical characteristics of high-current, (Hic) and high-strength, (Hs) type Ag/Bi2223 composite tapes measured at room temperature, RT and 77K is investigated. Mechanical strength of composites revealed strain-hardening signature in Bi2223 filaments due to plastic strain above the elastic limit. Critical current, Ic maintained constant value up to the elastic limit then decreased slowly before finally dropped to about 10% at 0.19% and 0.39% strain, signaling a three-stage limitation. Microstructure observations and electromechanical response of the composites suggest that a limited longitudinal, transverse, interfacial, granular and transgranular microcracks formed during gradual imposition of strain hardening in Bi2223 filaments may be responsible for the slow reduction of Ic in the medium mechanical stage.

Keywords

compositestress/strain relationshipsuperconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 946: Symposium HH – Recent Advances in Superconductivity , 2006 , 0946-HH04-08
Copyright
Copyright © Materials Research Society 2006

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