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Effects of Aging Hardenability and Microporosity Variation on the Quality Index of the Tensile Property of Al-6Si-xMg Casting Alloys

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Abstract

The relative contribution of aging hardenability to the overall dependence of tensile properties on microporosity variation in Al-6Si casting alloys was investigated in terms of the defect susceptibility concept for the quality index of tensile property. The tensile properties of as-cast and T6-treated Al-6Si-xMg alloys fabricated by the addition of 0.3-1.5 wt.% Mg were evaluated. Furthermore, the melt hydrogen concentration, melt fluidity, and scanning electron microscopy (SEM) fractographic porosity were measured. The increase in microporosity due to the decrease in melt fluidity with Mg addition was a fundamental factor in reducing the tensile strength and elongation, resulting in a lower quality index value than the nominal level in the base condition with no Mg addition. The increase in the strength coefficient and the decrease in the strain hardening exponent by Mg addition and T6 treatment were related to the increase in ultimate tensile strength (UTS) and decrease in elongation, respectively. Moreover, the defect susceptibility coefficient of the quality index based on microporosity variation decreased during T6 treatment with Mg addition. The quality index under the defect-free condition demonstrated a maximum value when 0.3 wt.% Mg was added, and its nominal value decreased gradually over a specific range of Mg addition, resulting in an increase in the fractographic porosity with a decrease in melt fluidity. The constitutive prediction of the quality index indicates the strength coefficient and strain hardening exponent determine the maximum quality index and defect susceptibility coefficient values, respectively.

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References

  1. A. Herrera and V. Kondic, Effect of Porosity on Tensile Properties of Two Al-Si Alloys, Proc Int Conf on Solidification and Cast Metals. P. Beeley Ed., The Metals Society, Sheffield, 1977

    Google Scholar 

  2. M.K. Surappa, E. Blank, and J.C. Januet, Effect of Macro-Porosity on the Strength and Ductility of Cast Al-7Si-0.3Mg alloy, Scripta Metall., 1986, 20, p 1281–1286.

    Article  CAS  Google Scholar 

  3. A.M. Gokhale and G.R. Patel, Analysis of Variability In Tensile Ductility Of A Semi-Solid Metal Cast A356 Al-Alloy, Mater. Sci. Eng. A., 2005, 392, p 184–190.

    Article  Google Scholar 

  4. A.M. Gokhale and G.R. Patel, Origins of Variability in the Fracture-Related Mechanical Properties of a Tilt-Pour-Permanent-Mold Cast Al-Alloy, Scripta Mater., 2005, 52, p 237–241.

    Article  CAS  Google Scholar 

  5. C.D. Lee, Quality Index of Tensile Property on Porosity Variation in A356 Casting Alloys upon T6 Treatment, Mater. Inter Met, 2019 https://doi.org/10.1007/s12540-019-00522-w

    Article  Google Scholar 

  6. M. Drouzy, S. Jacob, and M. Richard, Interpretation of Tensile Results by Means of Quality Index and Probable yield Strength, AFS Int. Cast Met. J., 1980, 5, p 43–50.

    CAS  Google Scholar 

  7. C.H. Cáceres, Material Properties and Quality Index in Al-Si-Mg casting alloys, AFS Trans., 1998, 106, p 601–604.

    Google Scholar 

  8. C.H. Cáceres, J.H. Sokolowski, and P. Gallo, Effect of Aging and Mg Content on the Quality Index of Two Model Al-Cu-Si-Mg alloys, Mater. Sci. Eng. A, 1999, 271, p 53–61.

    Article  Google Scholar 

  9. C.H. Cáceres and J. Barresi, Selection of Temper and Mg Content to Optimize the Quality index of Al-7Si-Mg Casting Alloy, Int. J. Cast Met. Res., 2000, 12, p 377–384.

    Article  Google Scholar 

  10. C.H. Cáceres, A Rationale for the Quality Index of Al-Si-Mg Casting Alloys, Int. J. Cast Met. Res., 2000, 12, p 385–391.

    Article  Google Scholar 

  11. C.H. Cáceres, A Phenomenological Approach to the Quality Index of Al-Si-Mg Casting Alloy, Int. J. Cast Met. Res., 2000, 12, p 367–375.

    Article  Google Scholar 

  12. P.N. Anyalebechi, Analysis of the Effects of Alloying Elements on Hydrogen Solubility in Liquid Alloys, Scripta Metall., 1995, 33, p 1209–1216.

    Article  CAS  Google Scholar 

  13. G.R. Jiang, Y.X. Li, and Y. Liu, Calculation of Hydrogen Solubility in Molten Alloy, Trans. Nonferrous Met. Soc. China, 2011, 21, p 1130–1135.

    Article  CAS  Google Scholar 

  14. H.S. Jang, H.J. Jang, P.H. Yoon, G.H. Lee, J.B. Jeon, J.Y. Park, E.S. Kim, and S.M. Shin, Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys, Metals, 2019, 9, p 1235–1248.

    Article  CAS  Google Scholar 

  15. Y.H. Tan, S.L. Lee, and Y.L. Lin, Effect of Be and Fe Contents on Plane Strain Fracture Toughness in A357 Alloys, Metall. Mater. Trans., 1995, 26A, p 2937–2945.

    Article  CAS  Google Scholar 

  16. C.H. Cáceres, C.J. Davidson, J.R. Griffiths, and Q.G. Wang, The Effect of Mg on the Microstructure and Mechanical Behavior of Al-Si-Mg casting alloys, Metall. Mater. Trans., 1999, 30A, p 2611–2618.

    Article  Google Scholar 

  17. A.K. Ghosh, Tensile Instability and Necking in Materials with Strain Hardening and Strain-Rate Hardening, Acta Metall., 1977, 25, p 1413–1424.

    Article  Google Scholar 

  18. C.D. Lee, K.S. Shin, and Y.J. Kim, Dependence of Tensile Ductility on Damage Evolution of Eutectic Si-Particles and Pre-Existing micro-Voids in Al-Si Casting Alloy, Eng. Mater. Frac., 2017, 175, p 339–356.

    Google Scholar 

  19. S.G. Lee, G.R. Patel, A.M. Gokhale, A. Sreeranganathan, and M.F. Horstemeyer, Quantitative Fractographic Analysis of Variability in the Tensile Ductility of High-Pressure Die-Cast AE44 Mg-Alloy, Mater. Sci. Eng. A., 2006, 427, p 255–262.

    Article  Google Scholar 

  20. C.D. Lee, Effect of damage evolution of Si particles on the variability of the tensile ductility of squeeze-cast Al-10%Si-2%Cu-0.4%Mg alloy, Mater. Sci. Eng. A, 2010, 527, p 3144–3150.

    Article  Google Scholar 

  21. C.D. Lee and K.S. Shin, Constitutive Prediction of the Defect Susceptibility of Tensile Properties to Microporosity Variation in A356 Aluminum Alloy, Mater. Sci. Eng. A, 2014, 599, p 223–232.

    Article  CAS  Google Scholar 

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Acknowledgments

This research was supported by the General Researcher Program through the National Research Foundation of Korea (NRF) and funded by the Ministry of Education, Science and Technology (NRF2017R1D1A1B03028953) and (NRF2020R1F1A1068118).

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  1. Department of Materials Science and Engineering, Inha Technical College, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea

    ChoongDo Lee

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Lee, C. Effects of Aging Hardenability and Microporosity Variation on the Quality Index of the Tensile Property of Al-6Si-xMg Casting Alloys. J. of Materi Eng and Perform 32, 3487–3499 (2023). https://doi.org/10.1007/s11665-022-07341-y

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  • DOI: https://doi.org/10.1007/s11665-022-07341-y

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