Strengthening Mechanism in Al2O3/SiC Particulate Composites

Autor:	Satoshi Iio, Keisuke Tanaka, Jun Otsuka, Masakazu Watanabe, Yo Tajima
Rok vydání:	1994
Předmět:	Toughness Materials science Annealing (metallurgy) Composite number General Chemistry Particulates Condensed Matter Physics Microstructure law.invention chemistry.chemical_compound Magazine chemistry Residual stress law Materials Chemistry Ceramics and Composites Silicon carbide Composite material
Zdroj:	Journal of the Ceramic Society of Japan. 102:29-34
ISSN:	1882-1022 0914-5400
DOI:	10.2109/jcersj.102.29
Popis:	Effects of sub-grain-boundaries (SGB) formed in Al2O3 grains and residual stress caused by additions of SiC particles in Al2O3 phase on the strength of Al2O3/SiC composites were investigated. The number of the SGB and the residual tensile stress in Al2O3 were found to increase with increasing SiC content. The experimental results suggest that the strengthening in Al2O3/SiC composites is attributable not only to the formation of the SGB but also to the toughness increases which is possibly related with the residual stress. The strengthening by annealing in Ar was also investigated. The annealing resulted in the strength increase of more than 200MPa, whereas the annealed and subsequently ground specimens did not show the strength increase. It is therefore concluded that the strengthening due to the anneal is mainly caused by healing of surface defects.
Databáze:	OpenAIRE
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