Microstructure and superconductivity in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> ceramics deformed at high temperatures: I. Microstructural considerations
M F Imaev; R M Imaev; O A Kaibyshev; F F Musin; M O Yamalova; M F Imaev; Inst. of Metals Superplasticity Problems, Acad. of Sci., Ufa, Russia; R M Imaev; Inst. of Metals Superplasticity Problems, Acad. of Sci., Ufa, Russia; O A Kaibyshev; Inst. of Metals Superplasticity Problems, Acad. of Sci., Ufa, Russia; F F Musin; Inst. of Metals Superplasticity Problems, Acad. of Sci., Ufa, Russia; M O Yamalova; Inst. of Metals Superplasticity Problems, Acad. of Sci., Ufa, Russia
Журнал:
Superconductor Science and Technology
Дата:
1994-10-01
Аннотация:
The effect of extrusive deformation at 875 degrees C on the microstructure of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> ceramics has been studied by optical metallography, transmission electron microscopy (TEM), X-ray structural and texture analysis. Dynamic recrystallization developing under deformation transforms the initial coarse-grained plate-like microstructure into a fine-grained equiaxial one with grain size less than 0.1 mu m. A mechanism is proposed for this transformation. An analysis of pole figures has shown that a radial (001) texture is formed during extrusion. Under increasing strain the homogeneity of the microstructure is enhanced, and the texture becomes more pronounced and sharp.
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