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The Effect of Fe-Rich Intermetallics on the Weibull Distribution of Tensile Properties in a Cast Al-5 Pct Si-3 Pct Cu-1 Pct Fe-0.3 Pct Mg Alloy

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Abstract

A comparison was made between the tensile properties of an Al-5 pct Si-3 pct Cu-1 pct Fe-0.3 pct Mg (319-type) alloy in the as-cast condition. The alloy was either unmodified or modified with Mn or Sr. The additions of 0.6 wt pct Mn, or 0.9 wt pct Mn, or 300 ppm Sr were made. All modifying additions increased the average and decreased the scatter in tensile strength, and increased elongation, with the Sr addition being most effective among the three. Fractographic examinations showed that the β phase, the polyhedral α phase, and porosity appear to be the main defects responsible for failure. The distribution of tensile strength has been quantitatively assessed using both two- and three-parameter Weibull distribution functions. In the two-parameter Weibull analysis, the high Weibull modulus (46) achieved by Sr modification is due to its binary effect on eutectic silicon and β platelets. Reservations about potentially misleading implications of the two-parameter approach are explored. The three-parameter Weibull analysis provides new information. In particular, minimum values of strength below which the material is extremely unlikely to fail are found. These values again show the clear benefit of Sr addition. The results are explained by the effects of modifying agents on the microstructure.

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Acknowledgments

Four of the authors (HZ, ME, AR, and MM) express their appreciation to the School of Metallurgy and Materials, University of Tehran, for providing the financial support for this research.

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Authors and Affiliations

  1. School of Metallurgy and Materials, University of Tehran, Tehran, Iran

    H. Zahedi (Master’s Student), M. Emamy (Associate Professor) & M. Mahta (Research Assistant)

  2. International University of Imam Khomeiny, Qazvin, Iran

    A. Razaghian (Assistant Professor)

  3. Department of Metallurgy and Materials, University of Birmingham, Birmingham, West Midlands, B15 2TT, United Kingdom

    J. Campbell (Professor Emeritus)

  4. Department of Engineering, Robert Morris University, Moon Township, PA, 15108, USA

    M. Tiryakioğlu (Professor of Engineering)

Authors
  1. H. Zahedi
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  2. M. Emamy
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  3. A. Razaghian
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  4. M. Mahta
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  5. J. Campbell
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  6. M. Tiryakioğlu
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Corresponding author

Correspondence to M. Tiryakioğlu.

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Manuscript submitted: April 25, 2006.

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Zahedi, H., Emamy, M., Razaghian, A. et al. The Effect of Fe-Rich Intermetallics on the Weibull Distribution of Tensile Properties in a Cast Al-5 Pct Si-3 Pct Cu-1 Pct Fe-0.3 Pct Mg Alloy. Metall Mater Trans A 38, 659–670 (2007). https://doi.org/10.1007/s11661-006-9068-3

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