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Freeform fabrication of aluminum metal-matrix composites

Published online by Cambridge University Press:  31 January 2011

C. W. Souvignier ,
T. B. Sercombe ,
S. H. Huo ,
P. Calvert  and
G. B. Schaffer
C. W. Souvignier
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721
T. B. Sercombe
Affiliation:
Department of Mining, Minerals and Materials Engineering, The University of Queensland, Qld 4072, Australia, and Interdisciplinary Research Center (IRC) in Advanced Materials, The University of Birmingham, Edgbaston, B15 2TT, United Kingdom
S. H. Huo
Affiliation:
Department of Mining, Minerals and Materials Engineering, The University of Queensland, Qld 4072, Australia
P. Calvert
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721
G. B. Schaffer
Affiliation:
Department of Mining, Minerals and Materials Engineering, The University of Queensland, Qld 4072, Australia
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Abstract

A series of metal-matrix composites were formed by extrusion freeform fabrication of a sinterable aluminum alloy in combination with silicon carbide particles and whiskers, carbon fibers, alumina particles, and hollow flyash cenospheres. Silicon carbide particles were most successful in that the composites retained high density with up to 20 vol% of reinforcement and the strength approximately doubles over the strength of the metal matrix alone. Comparison with simple models suggests that this unexpectedly high degree of reinforcement can be attributed to the concentration of small silicon carbide particles around the larger metal powder. This fabrication method also allows composites to be formed with hollow spheres that cannot be formed by other powder or melt methods.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 9 , September 2001 , pp. 2613 - 2618
Copyright
Copyright © Materials Research Society 2001

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