Grain size dependences of Vickers microhardness and fracture toughness in fully dense Al2O3 and Y2O3 ceramics without additives were examined. No grain size dependence of Vickers microhardness in Al2O3 and Y2O3 was observed, but the fracture toughness of Al2O3 ceramics decreased sharply with increasing grain size at about 20 μm. The grain size dependence of the fracture toughness in Y2O3 ceramics was almost constant from 0·2 to 214 μm. The difference in grain size dependence of fracture toughness for Al2O3 and Y2O3 ceramics was caused by the formation of microcracks due to the local microstresses produced by thermal expansion anisotropy, the crystal structure of Y2O3 being cubic and that of Al2O3 being hexagonal. © 1986 Elsevier Applied Science Publishers Ltd and Ceramurgica s.r.l., All rights reserved.
CITATION STYLE
Tani, T., Miyamoto, Y., Koizumi, M., & Shimada, M. (1986). Grain size dependences of vickers microhardness and fracture toughness in Al2O3 and Y2O3 ceramics. Ceramics International, 12(1), 33–37. https://doi.org/10.1016/S0272-8842(86)80007-4
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