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Interaction of Ca, P trace elements and Sr modification in AlSi5Cu1Mg alloys

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Abstract

Thermal and microscopy analyses were carried out to investigate the interaction of Sr modification with Ca and P trace elements in high-purity and commercial-purity Al–5Si–1Cu–Mg alloys. The results show how the addition of Sr to commercial-purity alloy induces significant changes in the nucleation and growth temperatures of eutectic Si since pre-eutectic Al2Si2(CaSr) intermetallics tend to poison AlP particles, making them inactive as nucleation sites for eutectic Si. In contrast, the addition of Sr to high-purity alloy shows no apparent influence on the characteristic temperatures of Al–Si eutectic reaction, even though the microstructural investigations reveal flake-to-fibrous transition in the eutectic Si structure. This indicates that the eutectic growth temperature, commonly used to predict eutectic modification level, is not a key feature of Sr modification, but it is indirectly caused due to the presence of additional impurities in commercial-purity alloys which affect the nucleation kinetics of eutectic Si.

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Acknowledgements

The authors would like to acknowledge Dr. A. Fabrizi for his precious work to perform experiments and characterizations.

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Authors and Affiliations

  1. Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3, 36100, Vicenza, Italy

    Jovid Rakhmonov, Giulio Timelli & Giulia Basso

  2. Department of Mechanical Engineering, Navoi State Mining Institute, Navoi, Uzbekistan

    Jovid Rakhmonov

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  1. Jovid Rakhmonov
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  2. Giulio Timelli
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  3. Giulia Basso
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Correspondence to Giulio Timelli.

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Rakhmonov, J., Timelli, G. & Basso, G. Interaction of Ca, P trace elements and Sr modification in AlSi5Cu1Mg alloys. J Therm Anal Calorim 133, 123–133 (2018). https://doi.org/10.1007/s10973-018-7111-4

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  • DOI: https://doi.org/10.1007/s10973-018-7111-4

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