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Alteration by Cerium Element on Primary and Eutectic Mg2Si Phases in Al-20%Mg2Si In Situ Composite

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Abstract:

Owing to its beneficial material properties, Al-Mg2Si in-situ composite has recently received wide attention and application in the manufacture of automotive and aerospace components. Melt treatment of the in-situ composite with the addition of Ce has resulted in a change in the primary and eutectic Mg2Si phases to refined morphology, which would be expected to improve the mechanical properties of the composite. Characteristic parameters of Mg2Si particles have been investigated via thermal and microstructural analysis. This has revealed that the addition of 0.8wt.% Ce produced optimum refinement effects on Mg2SiP because the coarse structure has been changed to a polygonal shape and reduced in size. Similarly, the flake-like morphology of Mg2SiE has been transformed into a rod-like or fibre form in addition to reduction of the eutectic cell area. The result also showed an increase in nucleation temperature TN of Mg2SiP while depressed for Mg2SiE, which also corresponds to the refinement morphology effect.

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Periodical:

Advanced Materials Research (Volume 1125)

Pages:

23-27

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1125.23

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Online since:

October 2015

Authors:

Nur Azmah Nordin, Saeed Farahany, Tuty Asma Abu Bakar*, Esah Hamzah

Keywords:

Cerium, In Situ Composite, Refinement, Thermal Analysis

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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