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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
Papers

Abstract

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.

Keywords

Polymer Heat Treatment Minor Phasis Major Phase Additional Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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