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Effect of Silver on Superplastic Deformation in YBa2Cu3O7–x/Ag Composites

Published online by Cambridge University Press:  31 January 2011

Jondo Yun ,
Ye T. Chou  and
Martin P. Harmer
Jondo Yun
Affiliation:
Division of Advanced Materials Engineering, Kyungnam University, Masan, 631–701, Korea
Ye T. Chou
Affiliation:
Division of Advanced Materials Engineering, Kyungnam University, Masan, 631–701, Korea
Martin P. Harmer
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015
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Extract

Superplastic deformation was studied in fine-grained (0.7–1.1 μm) YBa2Cu3O7–x/Ag composites containing 2.5–25 vol% Ag. The compression tests were conducted in the temperature range of 750–875 °C and at strain rates of 10−5 to 10−3/s. For the YBa2Cu3O7−x/25%Ag composites with grain size of 0.7–1.1 μm, deformed at 800–850 °C and 10−5 to 10−3/s, the stress exponent, grain size exponent, and the activation energy of deformation were 2.0 ± 0.1, 2.5 ± 0.7, and 760 ± 100 kJ/mol, respectively. These values were the same as those of the pure YBa2Cu3O7−x, indicating that the deformation of the composite was controlled by that of the rigid YBa2Cu3O7−x phase. However, the strain rate was increased by the addition of silver as explained by the soft inclusion model of Chen. The dependence of the flow stress on the silver content was in close agreement with the prediction of the model.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1172 - 1177
Copyright
Copyright © Materials Research Society 2002

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