Hot Deformation of YBa2Cu3O7-δ and Composite YBa2Cu3O7-δ/Ag |
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Authors: | Bryan C. Hendrix Teruyoshi Abe Janine C. Borofka Pin-Chin Wang John K. Tien |
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Affiliation: | Strategic Materials Research and Development laboratory, The University of Texas, Austin, Texas 78712–1063 |
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Abstract: | The response of ceramic superconductors and ceramic composites to compressive stresses at high temperatures has been examined. Monolithic YBa2Cu3O7-δ and composite YBa2Cu3O7-δ6/Ag were tested at constant true strain rates from 10-6 to 10-3 s-1 at temperatures from 800° to 950°C. Fine-grained monolithic YBa2Cu3O7-δ appears to have a regime of superplastic deformation between temperatures of 850° and 950°C at strain rates from 10-6 to 10-4 S-1. The addition of 20 vol% Ag to a coarser-grained material enhances the ductility of the ceramic and lowers the flow stress by a factor of 3 to 10. However, there is no evidence of superplasticity in the composite material in the range of temperature and strain rate where it was tested. |
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