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Open AccessArticle

Effect of Rare Earth Metals on the Microstructure of Al-Si Based Alloys

1
Industrial Engineering Program, Mechanical Engineering Department, College of Engineering, Prince Sattam bin AbdulAziz University, Al Kharj 11942, Saudi Arabia
2
Département des Sciences Appliquées, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
*
Author to whom correspondence should be addressed.
Academic Editors: Mark T. Whittaker and Robert Lancaster
Materials 2016, 9(1), 45; https://doi.org/10.3390/ma9010045
Received: 11 November 2015 / Revised: 11 December 2015 / Accepted: 5 January 2016 / Published: 13 January 2016
(This article belongs to the Special Issue Failure Analysis in Materials)
The present study was performed on A356 alloy [Al-7 wt %Si 0.0.35 wt %Mg]. To that La and Ce were added individually or combined up to 1.5 wt % each. The results show that these rare earth elements affect only the alloy melting temperature with no marked change in the temperature of Al-Si eutectic precipitation. Additionally, rare earth metals have no modification effect up to 1.5 wt %. In addition, La and Ce tend to react with Sr leading to modification degradation. In order to achieve noticeable modification of eutectic Si particles, the concentration of rare earth metals should exceed 1.5 wt %, which simultaneously results in the precipitation of a fairly large volume fraction of insoluble intermetallics. The precipitation of these complex intermetallics is expected to have a negative effect on the alloy performance. View Full-Text
Keywords: aluminum alloys; La and Ce addition; rare earth metals; modification; intermetallics aluminum alloys; La and Ce addition; rare earth metals; modification; intermetallics
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Alkahtani, S.A.; Elgallad, E.M.; Tash, M.M.; Samuel, A.M.; Samuel, F.H. Effect of Rare Earth Metals on the Microstructure of Al-Si Based Alloys. Materials 2016, 9, 45.

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