The fracture behavior of Al 2 O 3 /SiC nanocomposites has been studied as a function of the SiC volume fraction and compared to that of the pure Al 2 O 3 matrix. A pronounced strengthening effect was only observed for materials with low SiC content (i.e., ≤10 vol%) although no evidence of concurrent toughening was found. Assessment of near‐tip crack opening displacement (COD) could not experimentally substantiate significant occurrence of an elastic crack‐bridging mechanism, in contrast with a recently proposed literature model. Quantitative fractography analysis indicated that transgranular crack propagation in Al 2 O 3 /SiC nanocomposites depends on the location of the SiC dispersoids within the matrix texture; the higher the fraction of transgranularly located dispersoids, the more transgranular the fracture mode. Experimental evidence of remarkably high residual stresses arising from thermal dilatation mismatch (upon cooling) between Al 2 O 3 and SiC phases were obtained by fluorescence and Raman spectroscopy. A strengthening mechanism is invoked which merely arises from residual stress through strengthening of Al 2 O 3 grain boundaries.
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Ferroni et al. (2002) studied this question.
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