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

  • K.C. Goretta (a1), E.J. Zamirowski (a1), J.M. Calderoñ-Moreno (a2), D.J. Miller (a3), Nan Chen (a3), T.G. Holesinger (a3) and J.L. Routbort (a3)...

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.

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

  • K.C. Goretta (a1), E.J. Zamirowski (a1), J.M. Calderoñ-Moreno (a2), D.J. Miller (a3), Nan Chen (a3), T.G. Holesinger (a3) and J.L. Routbort (a3)...

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