Acoustic Emission and Microcracking in Sapphire, Sintered Al2O3, Al/Al2O3 Composite, and Aluminum

Autor:	Else Breval, Varanasi Srikanth, E. C. Subbarao
Rok vydání:	1995
Předmět:	Aluminium oxides Materials science Composite number chemistry.chemical_element Fracture toughness Brittleness chemistry Acoustic emission Aluminium Vickers hardness test Materials Chemistry Ceramics and Composites Sapphire Composite material
Zdroj:	Journal of the American Ceramic Society. 78:2541-2544
ISSN:	1551-2916 0002-7820
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::698517778b9de16d8e6e31008663c011 https://doi.org/10.1111/j.1151-2916.1995.tb08698.x Zobrazit plný text záznamu Plný text