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High-temperature deformation and fracture of Bi–Sr–Ca–Cu–O superconductors

Published online by Cambridge University Press:  03 March 2011

K.C. Goretta ,
E.J. Zamirowski ,
J.M. Calderoñ-Moreno ,
D.J. Miller ,
Nan Chen ,
T.G. Holesinger  and
J.L. Routbort
K.C. Goretta
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
E.J. Zamirowski
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
J.M. Calderoñ-Moreno
Affiliation:
Departamento de Física de la Materia Condensada, Universidad de Sevilla, 41080 Sevilla, Spain
D.J. Miller
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
Nan Chen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
T.G. Holesinger
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
J.L. Routbort
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
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Abstract

Dense polycrystalline Bi2Sr2Cu2Ox (2201), Bi2Sr2CaCu2Ox (2212), and (Bi, Pb)2Sr2Ca2Cu3Ox (2223) specimens were compressed in air at 730–835 °C. All of the materials exhibited an apparent steady-state creep response. Strain rate was proportional to stress to the 3.1–3.8 power. Apparent activation energies for the deformation processes were 520 ± 50 kJ/mole for the 2201, 630 ± 210 kJ/mole for the 2212, and 960 ± 210 kJ/mole for the 2223. Transmission electron microscopy revealed substantial generation and propagation of basal-plane dislocations during deformation. Few nonbasal-plane dislocations were observed. Intergranular fracture was evident in all deformed samples, and intragianular fracture was evident along the basal planes of some grains. It is suggested that the kinetics of fracture were determined by dislocation motion within the grains.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 3 , March 1994 , pp. 541 - 547
Copyright
Copyright © Materials Research Society 1994

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References

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