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A study on the thermodynamics of in situ MgAl2O4/Al MMC formation using amorphous silica sources

Sreekumar, V. M., Pillai, R.M., Pai, B.C. and Chakraborty, M. 2007, A study on the thermodynamics of in situ MgAl2O4/Al MMC formation using amorphous silica sources, Journal of materials processing technology, vol. 192-193, pp. 588-594, doi: 10.1016/j.jmatprotec.2007.04.083.

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Title A study on the thermodynamics of in situ MgAl2O4/Al MMC formation using amorphous silica sources
Formatted title A study on the thermodynamics of in situ MgAl2O4/Al MMC formation using amorphous silica sources
Author(s) Sreekumar, V. M.
Pillai, R.M.
Pai, B.C.
Chakraborty, M.
Journal name Journal of materials processing technology
Volume number 192-193
Start page 588
End page 594
Publisher Elsevier
Place of publication Lausanne, Switzerland
Publication date 2007-10
ISSN 0924-0136
1873-4774
Keyword(s) MgAl2O4
in situ composites
oxidation
crystallization energy
Summary MgAl2O4 (spinel) is considered as a commercially important ceramic reinforcement in MMC fabrication because of the possible tailorable properties imparted with Al for many applications. Generally, any oxygen source, i.e., the dissolved oxygen, or pure oxygen atmosphere or atmospheric oxygen is sufficient for the formation of MgAl2O4 in Al–Mg alloy. Among all the reactive oxygen sources, the reactivity of SiO2 with Al alloy is found to be higher. Amorphous silica is highly reactive in nature compared to crystalline silica. The present study has examined the thermodynamics of MgAl2O4 formation in Al–Mg alloy by amorphous silica sources with the aid of differential thermal analyzer (DTA) and the simulated experiments. The dissolution of Si and the formation of MgAl2O4 are detected as the endothermic peak and the immediate exothermic peak respectively in DTA curves and the presence of MgAl2O4 is confirmed by the XRD of the simulated sample. The MgO formed due to the oxidation of Mg in Al–Mg alloy has been found to influence the MgAl2O4 formation.
Language eng
DOI 10.1016/j.jmatprotec.2007.04.083
Field of Research 091201 Ceramics
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30028216

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