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Microstructure and mechanical properties of modified and non-modified stir-cast Al-Si hypoeutectic alloys

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Abstract

The microstructure and mechanical properties of modified and non-modified stir-cast commercial aluminium alloys A-S7G03 and A-S4G have been investigated. Stir casting of these alloys resulted in spherical and/or rosette shape primary α-phase, and the eutectic silicon was broken into miniature needle morphology. This stir-cast structure slightly improved the mechanical properties in comparison to those of conventionally cast alloys, however the fracture of the stir-cast alloys revealed intergranular brittle fracture. The addition of 0.02% strontium, in the form of Al-5 mass% Sr master alloy, during stir casting modified the eutectic silicon into a very fine spheroidal morphology, while the α-phase particle showed the same morphology as the stir-cast alloys. This novel structure resulted in significant improvement of mechanical properties. The elongation of the modified stir-cast alloys was five times greater than that of the non-modified one. A transgranular mode of fracture was observed for the modified stircast alloys, moreover smooth ripple and dimple patterns were observed reflecting the high ductility of the modified stir-cast alloys.

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Authors and Affiliations

  1. Mechanical Department, Faculty of Engineering, Al Azhar University, Cairo, Egypt

    Nabil Fat-Halla

  2. Ecole Nationale Superieur, Electriciens de Grenoble, Domaine Universitaire, bp 46, 38402, Saint Martin-d'Heres Cedex, France

    Pascal Secordel & Michel Suery

Authors
  1. Nabil Fat-Halla
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  2. Pascal Secordel
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  3. Michel Suery
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Fat-Halla, N., Secordel, P. & Suery, M. Microstructure and mechanical properties of modified and non-modified stir-cast Al-Si hypoeutectic alloys. J Mater Sci 23, 2419–2423 (1988). https://doi.org/10.1007/BF01111898

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  • DOI: https://doi.org/10.1007/BF01111898

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