Journal of Japan Foundry Engineering Society
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
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Volume 95, Issue 5
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Research Article
  • Influence of Na and P on Refinement and Spheroidization of Primary Si in Hypereutectic Al-Si Alloys
    Hideo Nakae, Haruka Nakamura, Izuru Iwasaki, Kota Kadoi
    2023 Volume 95 Issue 5 Pages 221-227
    Published: May 25, 2023
    Released on J-STAGE: June 01, 2023
    DOIhttps://doi.org/10.11279/jfes.95.221
    JOURNAL RESTRICTED ACCESS
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      The influence of Na and P on the refinement and spheroidization of primary Si in hypereutectic Al-Si alloys was studied using Al-12.6%Si-0.26%Na alloy and Na flux for Al-23%Si base metals. The base metals were prepared using high purity aluminum with semiconductor grade silicon, and commercial grade aluminum and metallic silicon for discussing the influence of phosphorus on primary Si morphology.

      For base metals with base metal P content exceeding several ppm, the primary Si was refined and spheroidized with the Al-Si-Na alloy. On the contrary, when the P content was less than 1ppm, the primary Si was neither refined nor spheroidized. The shape of primary Si in usual hypereutectic Al-Si alloys or P treated ones was regular octahedron, but cuboctahedron in spheroidized ones. Cuboctahedron Si was confirmed to be bicrystalline due to the adhesion of Na for EBSD and EPMA.

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