effects of la and ce addition on the modification of al-si based alloys

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ID: 249831
2016
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Abstract
This study focuses on the effects of the addition of rare earth metals (mainly lanthanum and cerium) on the eutectic Si characteristics in Al-Si based alloys. Based on the solidification curves and microstructural examination of the corresponding alloys, it was found that addition of La or Ce increases the alloy melting temperature and the Al-Si eutectic temperature, with an Al-Si recalescence of 2-3°C, and the appearance of post-α-Al peaks attributed to precipitation of rare earth intermetallics. Addition of La or Ce to Al-(7–13)% Si causes only partial modification of the eutectic Si particles. Lanthanum has a high affinity to react with Sr, which weakens the modification efficiency of the latter. Cerium, however, has a high affinity for Ti, forming a large amount of sludge. Due to the large difference in the length of the eutectic Si particles in the same sample, the normal use of standard deviation in this case is meaningless.
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elgallad2016advanceseffects Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Emad M. Elgallad;Herbert W. Doty;Saleh A. Alkahtani;Fawzy H. Samuel
Journal bulletin of the korean chemical society
Year 2016
DOI
10.1155/2016/5027243
URL
http://dx.doi.org/10.1155/2016/5027243
Keywords
materials of engineering and construction mechanics of materials

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