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Mechanical Properties of Textured Bi2Sr2CaCu2O8+delta High‐Temperature Superconductors
Author(s) -
Pastor Jose Ygnacio,
Poza Pedro,
LLorca Javier
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02214.x
Subject(s) - microstructure , materials science , transverse plane , scanning electron microscope , composite material , anisotropy , perpendicular , porosity , fiber , cleavage (geology) , fracture (geology) , optics , geometry , physics , mathematics , structural engineering , engineering
The mechanical properties of Bi 2 Sr 2 CaCu 2 O 8+delta fibers produced via laser‐induced directional solidification at different growth rates were determined through longitudinal and transverse tension tests, as well as flexure tests. In addition, polished sections of as‐received fibers and the fracture surfaces of the broken samples were examined using scanning electron microscopy to elucidate the relationship between the microstructure and the mechanical properties. The fibers were anisotropic, and the transverse fiber strength was very low, because of early failure via cleavage of the grains perpendicular to the c ‐axis. The longitudinal strength and the degree of anisotropy increased as the fiber growth rate decreased, whereas the transverse strength followed the opposite trend. This behavior was due to changes in the porosity and the alignment of the crystals along the fiber axis.