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Structural modification of Al-Si eutectic alloy by Sr and its effect on tensile and fracture characteristics

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Abstract

Modification of the commercial A-S13 alloy and high purity Al-Si eutectic alloy has been successfully achieved using Al-5 Sr master alloy. The refined structure showed more fine and uniformly distributed eutectic silicon in the high purity alloy. The incidence of Al-dendrites due to modification was related to the movement of the eutectic point to the higher-silicon side. The chill-cast alloys showed better refined structure and higher mechanical properties in comparison with the sand-cast alloys. The modified chill-cast alloy exhibited the best mechanical properties. The ultimate. tensile strength of which reached 280 M Pa and the elongation was 9.2%. The fracture patterns changed from well faceted brittle appearance to smooth silky and dimple-like for the normal and modified alloys respectively. This reflects the change from brittle to ductile behaviour after modification. A model for the fracture mechanism was proposed to explain the observed higher ductility for the modified alloy.

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Authors and Affiliations

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

    N. Fat-Halla

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  1. N. Fat-Halla
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Fat-Halla, N. Structural modification of Al-Si eutectic alloy by Sr and its effect on tensile and fracture characteristics. J Mater Sci 24, 2488–2492 (1989). https://doi.org/10.1007/BF01174517

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  • DOI: https://doi.org/10.1007/BF01174517

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