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Indentation-induced deformation and microcracking of highly textured superconducting (Bi,Pb)2Sr2Ca2Cu3Ox ceramic

Published online by Cambridge University Press:  03 March 2011

Wai Lo ,
A.M. Campbell ,
Jie Luo  and
R. Stevens
Wai Lo
Affiliation:
IRC in Superconductivity, Madingley Road, Cambridge CB3 OHE, United Kingdom
A.M. Campbell
Affiliation:
IRC in Superconductivity, Madingley Road, Cambridge CB3 OHE, United Kingdom
Jie Luo
Affiliation:
School of Materials, University of Leeds, Leeds LS2 9JT, United Kingdom
R. Stevens
Affiliation:
School of Materials, University of Leeds, Leeds LS2 9JT, United Kingdom
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Abstract

A high Tc ceramic superconductor has been prepared having a high degree of preferred orientation, this having been generated by means of a large magnetic field during the early stages of processing. The texture of the material has been characterized using XRD textural analysis and the microstructure by high resolution electron microscopy. Pyramidal indentation (Vickers indent), deformation, and cracking have been investigated using high resolution SEM. Semispherical deformation zones were formed under indents, a result of slipping of adjacent ab/ab (basal) plane grain boundaries and some microcrack development, together with lattice deformation on the basal plane. Densification of the green compact was also observed in the deformation zones, where lateral cracking has been seen to take place along the ab/ab plane grain boundaries. Radial cracking has been seen to take place along the low angle grain boundaries of the lattice ab/ab plane when indentations were made on the surface perpendicular to the preferred texture surface of the materials and also at the highly deformed corners of indent diagonals. The stresses generated resulted in the fracture of the flake-shaped grains and initiated small radial cracks. The Vickers microhardness of the textured ceramics was found to decrease with increasing load.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 3 , March 1995 , pp. 568 - 577
Copyright
Copyright © Materials Research Society 1995

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