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Microstructure Development in In Situ Reinforced Reaction‐Bonded Aluminum Niobate‐Based Composites
Author(s) -
Garciía Daniel E.,
Janssen Rolf,
Claussen Nils E.
Publication year - 1996
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.1151-2916.1996.tb08971.x
Subject(s) - materials science , nucleation , equiaxed crystals , microstructure , composite material , scanning electron microscope , bridging (networking) , fracture toughness , aluminium , toughness , in situ , chemistry , computer network , organic chemistry , computer science
Reaction‐bonded aluminum niobate‐based (AlNbO 4 ‐based) composites with tailorable microstructures were fabricated through controlled nucleation and growth of needlelike AlNbO 4 grains. Equiaxed to highly elongated grains were obtained by different heat treatments at 1340° and 1400°C in air. Scanning electron microscopy observations revealed that increasing the heating rate promoted the development of large, homogeneously distributed needlelike grains. Because of the elongated nature of the AlNbO 4 grains and the high residual stresses at the interface, enhanced crack wake bridging occurred. This bridging accounted for the observed increase of fracture toughness.