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R ‐Curve Behavior in Zirconia‐Reinforced Molybdenum Disilicide Composites
Author(s) -
Bhattacharya Arun K.,
Petrovic John J.
Publication year - 1992
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.1151-2916.1992.tb05436.x
Subject(s) - materials science , composite material , indentation , cubic zirconia , toughening , molybdenum , composite number , toughness , fracture toughness , molybdenum disilicide , ceramic , metallurgy
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.