Formation of MgO and Mg–Zn intermetallics in an Mg-based composite by in situ reactions

The fabrication and microstructural characterization of an Mg-based metal matrix composite, which is reinforced by MgO ceramic and Mg–Zn intermetallics is described. The fabrication process involved the mixing and pressing of Mg and ZnO powders, and was followed by sintering of the green compact at...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2005-01, Vol.36 (5), p.551-557
Main Authors: Deng, Cheng-Ji, Wong, M.L., Ho, M.W., Yu, Peng, Ng, Dickon H.L.
Format: Article
Language:English
Subjects:
A. Metal-matrix-composites (MMC)
Applied sciences
B. Microstructure
Dispersion hardening metals
E. Sintering
Exact sciences and technology
Metals. Metallurgy
Powder metallurgy. Composite materials
Production techniques
Reaction model
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Summary:The fabrication and microstructural characterization of an Mg-based metal matrix composite, which is reinforced by MgO ceramic and Mg–Zn intermetallics is described. The fabrication process involved the mixing and pressing of Mg and ZnO powders, and was followed by sintering of the green compact at a temperature below the melting point of Mg. The order of appearance of the in situ formed reinforcements, namely MgO and Zn–Mg eutectic, in the Mg matrix during sintering was investigated. Based on the Gibbs's free energy associated with each reaction, a model for the formation of this composite is postulated.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2004.09.001