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Oxidation‐Induced Toughening and Strengthening of Y 2 O 3 /SiC Nanocomposites
Author(s) -
Yoshimura Masashi,
Ohji Tatsuki,
Niihara Koichi
Publication year - 1997
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.1151-2916.1997.tb02903.x
Subject(s) - nanocomposite , materials science , toughening , composite material , fracture toughness , toughness , inert , compressive strength , inert gas , nanoparticle , residual stress , nanotechnology , chemistry , organic chemistry
Effects of oxidation on mechanical properties have been investigated for Y 2 O 3 /5 vol% SiC nanocomposite. The roomtemperature fracture strength and toughness substantially increased after oxidation around 900–1000°C for 5 h. On the other hand, little improvement was identified for specimens treated in an inert atmosphere under the same conditions. A TEM study of the oxidized specimen surfaces revealed formation of extensive residual strain contours around SiC nanoparticles. The improved strength and toughness could be caused by compressive surface stress, which was generated by volume expansion of the nanoparticles due to oxidation.