Breval, Else ; Srikanth, Varanasi ; Subbarao, Eleswarapu C. (1995) Acoustic emission and microcracking in sapphire, sintered Al2O3, Al/Al2O3 composite, and aluminum Journal of the American Ceramic Society, 78 (9). pp. 2541-2544. ISSN 0002-7820
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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1151-...
Related URL: http://dx.doi.org/10.1111/j.1151-2916.1995.tb08698.x
Abstract
A range of materials with brittle to ductile behavior (single-crystal and polycrystalline alumina, aluminum/alumina composite, and metallic aluminum) were investigated by acoustic emission (AE) methods for microcracking during hardness indentations or cooling from elevated temperatures (800° C). During indentation, the extent of crack formation (and the AE counts) decreased in the following order: sapphire, sintered alumina, aluminum/alumina composite with no microcracking in metallic aluminum. During cooling from 800° C, polycrystalline alumina exhibited more extensive microcracking than the aluminum/alumina composite, suggesting that the metallic phase in the aluminum/alumina composite absorbs stresses more than the glassy boundary phase in sintered alumina.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons. |
| ID Code: | 50487 |
| Deposited On: | 25 Jul 2011 11:06 |
| Last Modified: | 25 Jul 2011 11:06 |
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