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Microstructural development in Al/MgAl2O4 in situ metal matrix composite using value-added silica sources

Sreekumar, Vadakke Madathil, Pillai, Raman Marimuthu, Pai, Bellampettu Chandrasekhara and Chakraborty, Madhusudhan 2008, Microstructural development in Al/MgAl2O4 in situ metal matrix composite using value-added silica sources, Science and technology of advanced materials, vol. 9, no. 1, pp. 1-9, doi: 10.1088/1468-6996/9/1/015004.

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Title Microstructural development in Al/MgAl2O4 in situ metal matrix composite using value-added silica sources
Author(s) Sreekumar, Vadakke Madathil
Pillai, Raman Marimuthu
Pai, Bellampettu Chandrasekhara
Chakraborty, Madhusudhan
Journal name Science and technology of advanced materials
Volume number 9
Issue number 1
Start page 1
End page 9
Total pages 9
Publisher Institute of Physics Publishing Ltd.
Place of publication Bristol, England
Publication date 2008
ISSN 1468-6996
1878-5514
Summary Al/MgAl2O4 in situ metal matrix composites have been synthesized using value-added silica sources (microsilica and rice husk ash) containing ~97% SiO2 in Al-5 wt.% Mg alloy. The thermodynamics and kinetics of MgAl2O4 formation are discussed in detail. The MgO and MgAl2O4 phases were found to dominate in microsilica (MS) and rice husk ash (RHA) value-added composites, respectively, during the initial stage of holding the composites at 750 °C. A transition phase between MgO and MgAl2O4 was detected by the scanning electron microscopy and energy-dispersive spectroscopy (SEM–EDS) analysis of the particles extracted from the composite using 25% NaOH solution. This confirms that MgO is gradually transformed to MgAl2O4 by the reaction 3SiO2(s)+2MgO(s)+4Al(l)→2MgAl2O4(s)+3Si(l). The stoichiometry of MgAl2O4, n, computed by a new methodology is between 0.79 and 1.18. The reaction between the silica sources and the molten metal stopped after 55% of the silica source was consumed. A gradual increase in mean MgAl2O4 crystallite size, D, from 24 to 36 nm was observed in the samples held for 10 h.
Language eng
DOI 10.1088/1468-6996/9/1/015004
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, National Institute for Materials Science
Persistent URL http://hdl.handle.net/10536/DRO/DU:30028120

Document type: Journal Article
Collection: School of Engineering
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