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Effect of particle size on fracture toughness of SiC/Al composite materialDiscontinuous SiC/Al composites with SiC particles of different sizes were fabricated in order to study the role of particle size on the fracture process. The fracture process is confined to a very narrow band and takes place within the matrix in composites containing small SiC particle sizes. In the composite reinforced with SiC particles of 20 microns and above fracture of SiC begins to dominate. The matrix is influenced by the high density of dislocations generated at SiC/Al interfaces due to the difference in coefficient of thermal expansion between SiC and the Al matrix. Crack initiation fracture toughness does not depend on SiC particle size. Crack growth fracture toughness increases as the size of the SiC particle increase.
Document ID
19900024478
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Flom, Y.
(NASA Goddard Space Flight Center Greenbelt, MD; Maryland, University, College Park, United States)
Arsenault, R. J.
(Maryland, University College Park, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Acta Metallurgica
Volume: 37
ISSN: 0001-6160
Subject Category
Composite Materials
Accession Number
90A11533
Funding Number(s)
CONTRACT_GRANT: N00014-85-K-0007
Distribution Limits
Public
Copyright
Other

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