Grain size dependence of fracture toughness for fine grained alumina
► Fully dense fine grained aluminas with grain size from 290 nm to 3.3 μm were obtained. ► Fracture toughness values with different grain sizes were statistically analyzed. ► Fracture toughness in fine grained alumina is independent of grain size. ► Characteristic fracture toughness in fine grained...
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Published in | Scripta materialia Vol. 65; no. 2; pp. 143 - 146 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.07.2011
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Subjects | |
Online Access | Get full text |
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Summary: | ► Fully dense fine grained aluminas with grain size from 290
nm to 3.3
μm were obtained. ► Fracture toughness values with different grain sizes were statistically analyzed. ► Fracture toughness in fine grained alumina is independent of grain size. ► Characteristic fracture toughness in fine grained alumina is 3.37
MPa
m
1/2.
The fracture toughness of a series of fully dense polycrystalline alumina samples prepared by electrical field assisted sintering with grain sizes varying from ∼290
nm to ∼3.3
μm was measured using the surface crack in flexure method. Fracture toughness values for different grain sizes were statistically analyzed based on the Weibull distribution. It was found that the fracture toughness in fine grained alumina is independent of grain size. The characteristic fracture toughness calculated from the Weibull distribution is 3.37
MPa
m
1/2. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1359-6462 1872-8456 |
DOI: | 10.1016/j.scriptamat.2011.03.032 |