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Dissolution of iron intermetallics in Al-Si Alloys through nonequilibrium heat treatment

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Abstract

Conventional heat treatment techniques in Al-Si alloys to achieve optimum mechanical properties are limited to precipitation strengthening processes due to the presence of second-phase particles and spheroidization of silicon particles. The iron intermetallic compounds present in the microstructure of these alloys are reported to be stable, and they do not dissolve during conventional (equilibrium) heat treatments. The dissolution behavior of iron intermetallics on nonequilibrium heat treatment has been investigated by means of microstructure and mechanical property studies. The dissolution of iron intermetallics improves with increasing solution temperature. The addition of manganese to the alloy hinders the dissolution of iron intermetallics. Nonequilibrium heat treatment increases the strength properties of high iron alloys until a critical solution temperature is exceeded. Above this temperature, a large amount of liquid phase is formed as a result of interdendritic and grain boundary melting. The optimum solution treatment temperature for Al-6Si-3.5Cu-0.3Mg-lFe alloys is found to be between 515 °C and 520 °C.

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Authors and Affiliations

  1. Department of Mining and Metallurgical Engineering and Departement des Sciences Appliqueès, McGill University-Universitè du Québec à Chicoutimi, Canada

    L. Anantha Narayanan (Doctoral Student)

  2. Departement des Sciences Appliqueès, Universitaè du Quèbec à Chicoutimi, G7H 2B1, Chicoutimi, PQ, Canada

    F. H. Samuel (Professor)

  3. Department of Mining and Metallurgical Engineering, McGill University, H3A 2A7, Montreal, PQ, Canada

    J. E. Gruzleski (Professor)

Authors
  1. L. Anantha Narayanan
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  2. F. H. Samuel
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  3. J. E. Gruzleski
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Narayanan, L.A., Samuel, F.H. & Gruzleski, J.E. Dissolution of iron intermetallics in Al-Si Alloys through nonequilibrium heat treatment. Metall Mater Trans A 26, 2161–2174 (1995). https://doi.org/10.1007/BF02670687

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  • DOI: https://doi.org/10.1007/BF02670687

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