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Non-equilibrium phase distribution in an Al-SiC compositeThe phase distribution in an Al-SiC composite has been investigated using high resolution analytical electron microscopy. Particular attention was focused on Al-SiC interfaces, matrix boundaries and impurity phases which would impede the easy glide of dislocations. Small crystallites of MgO were distributed singly and in clusters along Al-SiC interfaces in all specimens. Interfacial segregation and precipitation involving alloy species apparently affected precipitation in the matrix, where the distribution of phases was found to be very heterogeneous. Matrix phases also included unusually large constituent particles and dispersoids, a consequence of the composite processing methods. The relationship between the observed microstructure and the composite mechanical behavior reported by others is discussed. The heterogeneous distribution of matrix phases is expected to result in a wide variaiton in local yield stress and local work-hardening rate within the composite.
Document ID
19860037110
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nutt, S. R.
(Arizona State Univ. Tempe, AZ, United States)
Carpenter, R. W.
(Arizona State University Tempe, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1985
Publication Information
Publication: Materials Science and Engineering
Volume: 75
ISSN: 0025-5416
Subject Category
Composite Materials
Accession Number
86A21848
Funding Number(s)
CONTRACT_GRANT: NAG1-426
CONTRACT_GRANT: NSF DMR-83-06501
Distribution Limits
Public
Copyright
Other

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