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Precipitation of Sr-rich intermetallic particles and their influence on pore formation in Sr-modified A356 alloy

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Abstract

The nature of enhanced pore formation in Sr-modified A356 Al alloy melts has been investigated, leading to the observation of the precipitation of Sr-rich compounds on the wetted side of oxide films. Scanning electron microscopy of casting surfaces showed that the surface oxide film might be a good possible nucleation site of Sr-rich compounds. The observation of internal pores using secondary electron microscopy and X-ray microanalysis mapping showed precipitation of Sr-rich compounds on the wetted side of the oxide films in most pores. The possibility of Sr-rich intermetallics being nucleated on oxide films was assessed by determining their planar disregistry factor; good matching planes were found between Al2Si2Sr intermetallics and γ-Al2O3 and spinel oxide films. The crystallographic alignment revealed in scanning electron microscope (SEM) images also corroborates an epitaxial relationship. Mechanisms by which Sr in Al-Si alloys may contribute to the formation of porosity are discussed.

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Authors and Affiliations

  1. the Department of Metallurgy and Materials, Faculty of Engineering, Rajaei University, 16788, Lavizan, Tehran, Iran

    S. M. Miresmaeili (Lecturer)

  2. the Department of Metallurgy and Materials, School of Engineering, University of Birmingham, B15 2TT, Birmingham, United Kingdom

    J. Campbell (Professor)

  3. the Department of Materials and Metallurgical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran

    S. G. Shabestari (Associate Professor) & S. M. A. Boutorabi (Professor)

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  1. S. M. Miresmaeili
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  2. J. Campbell
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  3. S. G. Shabestari
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  4. S. M. A. Boutorabi
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Miresmaeili, S.M., Campbell, J., Shabestari, S.G. et al. Precipitation of Sr-rich intermetallic particles and their influence on pore formation in Sr-modified A356 alloy. Metall Mater Trans A 36, 2341–2349 (2005). https://doi.org/10.1007/s11661-005-0106-3

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  • DOI: https://doi.org/10.1007/s11661-005-0106-3

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