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Structure, mechanical properties and fracture of aluminium alloy A-356 modified with Al-5Sr master alloy

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Abstract

The cooling rate during solidification of the aluminium-silicon alloy A-356 was found to have a pronounced effect not only on the structure and mechanical properties, but also on the modification process using Al-5 mass% Sr master alloy. Cooling rates in the range of 0.2 to 5 K sec−1 were conducted using different types of moulds. Decreasing the cooling rate increases the degree of modification obtained, and a cooling rate of 0.2 K sec−1 showed the optimum modification in the present study. The mechanical properties were significantly improved by modification. Ductility of the modified alloy was eight times greater than that for the non-modified one. Moreover, the mechanical properties of the modified alloys, in the present study, were higher than those modified with sodium, and additionally the ductility of the present modified alloy was higher than that for alloys modified with strontium. A tendency towards ductile rupture was observed. The transgranular type of fracture was optically detected, and a dimple-pattern was observed on the fracture surface by scanning electron microscopy.

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Authors and Affiliations

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

    Nabil Fat-Halla

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  1. Nabil Fat-Halla
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Fat-Halla, N. Structure, mechanical properties and fracture of aluminium alloy A-356 modified with Al-5Sr master alloy. J Mater Sci 22, 1013–1018 (1987). https://doi.org/10.1007/BF01103544

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  • DOI: https://doi.org/10.1007/BF01103544

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