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High temperature deformation of vertical gradient freeze method melt-textured Y1Ba2Cu3O7−x

Published online by Cambridge University Press:  31 January 2011

A. Leenders ,
M. Ullrich ,
L.-O. Kautschor  and
H. C. Freyhardt
A. Leenders
Affiliation:
Zentrum für Funktionswerkstoffe Göttingen gGmbH, Windausweg 2, 37073 Göttingen, Germany and Institut für Metallphysik, Universität Göttingen, Hospitalstrasse 3-7, 37073 Göttingen, Germany
M. Ullrich
Affiliation:
Zentrum für Funktionswerkstoffe Göttingen gGmbH, Windausweg 2, 37073 Göttingen, Germany
L.-O. Kautschor
Affiliation:
Institut für Metallphysik, Universität Göttingen, Hospitalstrasse 3-7, 37073 Göttingen, Germany
H. C. Freyhardt
Affiliation:
Zentrum für Funktionswerkstoffe Göttingen gGmbH, Windausweg 2, 37073 Göttingen, Germany and Institut für Metallphysik, Universitöt Göttingen, Hospitalstrasse 3-7, 37073 Göttingen, Germany
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Abstract

The deformation behavior of melt-textured Y1Ba2Cu3O7-x (YBCO) prepared by the vertical gradient freeze (VGF) method was investigated by high temperature deformation experiments at temperatures ranging from 850 to 950 °C. The experiments were performed in an atmosphere of pure oxygen under uniaxial pressure with constant strain rates in the range from 1 × 10−5 to 5 − 10−4 s−1. An analysis of the dependence of the steady state flow stress on the strain rate and the deformation temperature reveals that the predominant deformation mechanism is dislocation glide and climb controlled by climb at Y-211 particles and that no significant grain boundary sliding occurs. Furthermore, transmission electron microscopy observations of deformed and undeformed samples support a deformation mechanism based on dislocation movement. The total fracture strain, however, does not depend on the temperature or strain rate. Scanning electron microscopy investigations of the fracture faces of samples deformed until fracture reveal that fracture does not occur within the Y-123 matrix but along platelet boundaries. An improvement of the fracture behavior is expected by introducing large Y-211 particles interconnecting neighboring platelets.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 354 - 358
Copyright
Copyright © Materials Research Society 1999

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