Abstract
An appropriate model of combine toughening in ceramic composites toughened with whiskers and transformation particles is presented to identify the effects of whisker toughening and transformation toughening. Whisker toughening includes whisker bridging and crack deflection. For transformation toughening, the shear effect is considered by using a shear factor, f, based on the dilatation contribution. Calculated results show that there are interactions among whisker bridging, crack deflection and transformation toughening. Crack bridging and crack deflection give rise to the contribution of transformation toughening, but transformation toughening produces a reduce to the contributions of whisker bridging and crack deflection. Predictions of the toughness of SiC w/ZrO 2(2mol%Y 2O 3)/Al 2O 3 based on the present model are showed to be in good agreement with the experimental results.
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