Hot Deformation of YBa2Cu3O7‐δ and Composite YBa2Cu3O7‐δ/Ag
- 1 April 1993
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 76 (4) , 1008-1010
- https://doi.org/10.1111/j.1151-2916.1993.tb05327.x
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.Keywords
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