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R ‐curves for hot‐pressed 20 vol% ZrO 2 (2.5‐YPSZ and 8‐YPSZ) reinforced MoSi 2 composites were evaluated using the indentation/bend technique. Results indicated a modest increase in the material toughness for both composites. Experimental R ‐curves were compared with theoretically predicted R ‐curves to evaluate the critical transformation stress for the partially stabilized ZrO 2 composite. A high critical transformation stress value obtained was indicative of the inhibition of transformation toughening effects due to microstructural inhomogeneity in the partially stabilized ZrO 2 ‐MoSi 2 composites.
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Bhattacharya et al. (1992) studied this question.
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