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Fracture of Isotropic and Textured Ba Hexaferrite
Author(s) -
IWASA M.,
LIANG E. C.,
BRADT R. C.,
NAKAMURA Y.
Publication year - 1981
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.1151-2916.1981.tb09876.x
Subject(s) - materials science , fracture toughness , transgranular fracture , composite material , isotropy , anisotropy , grain boundary , brittleness , texture (cosmology) , fracture (geology) , ferrite (magnet) , mineralogy , microstructure , chemistry , intergranular fracture , optics , physics , image (mathematics) , artificial intelligence , computer science
The effects of texture and temperature on the fracture toughness of an oriented Ba hexaferrite were studied. An isotropic ferrite was also measured. Anisotropy of K le at room temperature in the oriented ferrite was a factor of 3, with the transgranular fracture having a K lc of 2.83 MN‐m −3/2 . Toughness decreased with increasing temperature, exhibiting two regions of behavior: a low‐temperature brittle elastic fracture region of — (dK lc /dT) of 10‐ −4 MN · m −3/2 . °C −1 and a distinct high‐temperature region of 10‐ −2 MN · m −3/2 . °C −1 which exhibited 100% grain‐boundary fracture.