The effect of casting variables on the structure of hypereutectic Al-Si alloys

M. Faraji, J. Todd, H. Jones

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations


The effect of size refinement of primary silicon and modification of eutectic silicon, separately and simultaneously, on microstructure of hypereutectic Al-20wt%Si has been investigated under different casting conditions. Results showed that number per unit volume of primary silicon particles was doubled by inoculation with 0.02% phosphorus in the alloy with 0.0015% phosphorus already in it, whereas 70% of a small ingot (40×35 mm) became modified eutectic, and the formation of primary silicon was suppressed, on adding 0.1% strontium. Simultaneous addition of phosphorus and strontium still refined the primary silicon but did not modify the eutectic. Addition of strontium alone caused roughening of the primary silicon, exemplified by increased undercooling registered on the cooling curve. Also crystallographic relationships between polyhedral primary silicon particles have been investigated by Electron Back Scattered Diffraction (EBSD).

Original languageEnglish (US)
Title of host publicationAluminium Alloys 2006
Subtitle of host publicationResearch Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys
PublisherTrans Tech Publications Ltd
Number of pages6
EditionPART 2
ISBN (Print)9780878494088
StatePublished - 2006
Event10th International Conference on Aluminium Alloys, (ICAA-10) - Vancouver, Canada
Duration: Jul 9 2006Jul 13 2006

Publication series

NameMaterials Science Forum
NumberPART 2
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other10th International Conference on Aluminium Alloys, (ICAA-10)

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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