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Partial melting and segregation behavior in a superplastic Si3N4/Al–Mg alloy composite

Published online by Cambridge University Press:  03 March 2011

J. Koike ,
M. Mabuchi  and
K. Higashi
J. Koike*
Affiliation:
Department of Mechanical Engineering. Oregon State University, Corvallis, Oregon 97331
M. Mabuchi
Affiliation:
National Industrial Research Institute of Nagoya, 1 Hirate-cho, Kita-ku, Nagoya 462, Japan
K. Higashi
Affiliation:
Department of Mechanical Systems Engineering, College of Engineering, University of Osaka Prefecture, Sakai, Osaka 593, Japan
*
a)Present address: Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan.
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Abstract

AJ-Mg alloy (5052) composite reinforced with Si3N4 particulates was investigated by transmission electron microscopy and electron energy loss spectroscopy. Partial melting was observed at matrix/reinforcement interfaces and matrix grain boundaries at a temperature near an optimum superplastic temperature. Segregation of solute elements (Mg and Si) was observed at the interfaces and grain boundaries. Both partial melting and solute segregation were found to depend on grain boundaries. The obtained results were explained by a decrease of the solidus temperature due to segregation whose extent depends on the type of the grain boundary structure.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 1 , January 1995 , pp. 133 - 138
Copyright
Copyright © Materials Research Society 1995

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