Journal of Materials Science

, Volume 28, Issue 19, pp 5349–5354 | Cite as

The morphology of particles of minor phases in a commercial Al-7.12wt% Si alloy

  • C. C. Chama


The morphology of particles of minor phases was monitored in an Al-7.12 wt% Si alloy in three different states: as-cast, hot isostatically pressed (HIPed) and heat-treated. In all of these states, the minor phases existing in this alloy were secondary silicon-rich particles and those which are iron-containing-Al12Fe3Si and (FeAl6) Si. The major phase was primary silicon-rich particles. The HIPed and heat-treated materials contained an additional phase, the iron-containing particles Al9Fe2Si2. It was found that secondary silicon-rich particles in the as-cast material were plate-like, spherical or fibrous. On the other hand, the few iron-containing particles in the as-cast material were needle-like. During HIPing or heat treatment, the iron-containing particles which precipitated also had a needle-like morphology. Most of the non-spherical secondary silicon-rich particles tended to spheroidize during HIPing or heat treatment. Fibrous secondary silicon-rich particles were not present in the HIPed or heat-treated materials.


Polymer Heat Treatment Minor Phasis Major Phase Additional Phase 
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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • C. C. Chama
    • 1
  1. 1.Department of Metallurgy and Mineral ProcessingUniversity of ZambiaLusakaZambia

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