Abnormal Stress–Strain Properties of Bi-2223 Tapes |
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| Authors: | Wu Ming Chen M. Yavuz |
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| Affiliation: | (1) Center of Applied Superconductivity and Electrical Engineering, School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;(2) Mechatronics Program, Mechanical Engineering Department, University of Waterloo, Waterloo, ON, N2L 3G1, Canada |
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| Abstract: | The stress–strain properties of Bi-2223 tapes directly relate to its applications, but have not been systematically studied yet. Three tapes sheathed by Ag and Ag alloys were manufactured for the study of stress–strain. X-ray diffraction analyses were used to determine the amorphous and Bi-2223 phases for the three tapes before and after sintering. Tensile experiments were performed to study the stress–strain properties as well. Micro-morphologies of the three tapes were observed and recorded by scanning electron microscopy. The experimental results show green tapes with a linear stress–strain relation. It is suggested that this relation comes from the sheathed metal’s properties. The mechanical properties of Ag/Mg sheathed tapes are like those of a rigid body, which do not present plasticity and elasticity. The phenomena of outgrowth and bridges were observed in Ag and Ag/Sb sheathed tapes. Also, Ag and Ag/Sb sheathed tapes showed abnormal stress–strain properties, which were subjected to micro-cracks existing in the sheathed metals and imperfections of Bi-2223 crystals. |
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| Keywords: | Stress– strain Bi-superconductors Outgrowth Bridge Phase transformation |
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