期刊
SCRIPTA MATERIALIA
卷 69, 期 5, 页码 362-365出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.05.017
关键词
Alumina; Transparent; Nanocrystalline; High pressure; Hardness
类别
资金
- JST
- PRESTO
- New Materials Science and Element Strategy
- Grants-in-Aid for Scientific Research [25106006] Funding Source: KAKEN
Transparent nanocrystalline bulk alumina was obtained at 7.7 GPa and 800 degrees C. The alumina has an average grain size of similar to 150 nm and an in-line transmission of 71% for a wavelength of 640 nm and a thickness of 0.8 mm. The values of microhardness and fracture toughness were found to be 25.5 +/- 0.3 GPa and 2.9 +/- 0.3 MPa m(1/2), respectively. The hardness value is consistent with the previously determined Hall-Petch relation and fracture toughness is independent of grain size. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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