Direct correlations between fracture toughness and grain boundary segregation behavior in ytterbium-doped magnesium aluminate spinel

The effect of ytterbium (Yb) on magnesium aluminate spinel (MgAl2O4) grain boundary structure and strength has been evaluated using mechanical testing and electron microscopy. Bicrystal specimens were prepared by hot pressing. Certain interfaces were doped with Yb prior to bonding. Interfaces were c...

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Bibliographic Details
Published in:Scripta materialia 2013-07, Vol.69 (1), p.81-84
Main Authors: Cao, W., Kundu, A., Yu, Z., Harmer, M.P., Vinci, R.P.
Format: Article
Language:English
Subjects:
Bonding
Cantilever beam test
Correlation
Fracture toughness
Grain boundaries
Grain boundary segregation
High-angle annular dark-field (HAADF)
Hot pressing
Magnesium aluminate
Segregations
Spinel
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Summary:The effect of ytterbium (Yb) on magnesium aluminate spinel (MgAl2O4) grain boundary structure and strength has been evaluated using mechanical testing and electron microscopy. Bicrystal specimens were prepared by hot pressing. Certain interfaces were doped with Yb prior to bonding. Interfaces were characterized using atomic-resolution high-angle annular dark-field imaging. Interface fracture toughness was determined using a microscale cantilever beam test. A 30% increase in fracture toughness was found to correlate with grain boundary Yb segregation.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2013.03.002