Fracture toughness of nanocrystalline ZrO{sub 2}-3mol% Y{sub 2}O{sub 3} determined by Vickers indentation
Journal Article
·
· Scripta Materialia
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
Nanocrystalline 3Y-ZrO{sub 2} with densities ranging from 90.4% to 98.7% of theoretical and grain sizes from 55 nm to 160 nm were tested by Vickers indentation. The hardness of nanocrystalline and submicron (Tosoh) 3Y-ZrO{sub 2} was a strong function of density but independent of grain size and could be expressed as Hardness (GPa) = 0.549*Density (in %) + 40.449 with a correlation coefficient, R, of 0.919. The fracture toughness of both submicron and nanocrystalline 3Y-ZrO{sub 2} was low, about 2.5--4.5 MPa{center_dot}m{sup 1/2}, in contrast with the 8.4 MPa{center_dot}m{sup 1/2} for a micron-grained 3Y-ZrO{sub 2} sample. In addition, the fracture toughness was relatively constant over all density and grain size ranges studied (55--400 nm; 90--100% density). The low fracture toughness, combined with no perceptible grain size dependence, implies that there is not a significant room temperature ductility mechanism peculiar to nanocrystalline materials. Minor effects may exist, but they are not sufficient to noticeably increase the fracture toughness. Because the data fit with existing trends of decreasing transformation toughening with decreasing grain size, it is presumed the poor fracture toughness of the nanocrystalline samples is due to a diminished capacity to transformation toughen via the tetragonal-to-monoclinic transformation.
- OSTI ID:
- 215354
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 5 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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