Shape Casting pp 131-141 | Cite as

On the Effects of Defects and Imperfections on Tensile Toughness of a Secondary Aluminium Alloy

  • Jakob OlofssonEmail author
  • Anton Bjurenstedt
  • Salem Seifeddine
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


In order to design and produce high-quality castings with reliable performance, the effect of the melt handling and melt quality during different processing stages needs to be understood and controlled, and numerical methods to provide correct input data to structural analyses of castings enabled. This paper aims to investigate tensile properties, in particular tensile toughness, of a secondary high-pressure die casting (HPDC) aluminium alloy with different levels of defects and imperfections. The melt, which was transported in liquid state from the smelter to the foundry, has been sampled after different holding times by casting into Y-blocks. Tensile testing was performed, and the levels of defects and imperfections were characterized using measurements of porosity, bifilm index, density index, sludge factor and the amount of iron-rich intermetallics. Two different quality indices have been evaluated, and a method to apply the results in simulations of damage in a casting, containing defects, subjected to load is demonstrated.


Toughness Defects Quality index Shape casting Component casting 



The Swedish Knowledge Foundations are greatly acknowledged for financing the CompCAST+ research profile at Jönköping University.


  1. 1.
    Do Lee C (2007) Effects of microporosity on tensile properties of A356 aluminum alloy. Mater Sci Eng A 464:249–254CrossRefGoogle Scholar
  2. 2.
    Lebyodkin M, Deschamps A, Bréchet Y (1997) Influence of second-phase morphology and topology on mechanical and fracture properties of Al-Si alloys. Mater Sci Eng A 234–236:481–484CrossRefGoogle Scholar
  3. 3.
    Wang QG, Cáceres CH, Griffiths JR (2003) Damage by eutectic particle cracking in aluminum casting alloys A356/357. Metall Mater Trans A 34:2901–2912CrossRefGoogle Scholar
  4. 4.
    Wang QG, Apelian D, Lados DA (2001) Fatigue behavior of A356/357 aluminum cast alloys. Part II-Effect of microstructural constituents. J Light Met 1:85–97CrossRefGoogle Scholar
  5. 5.
    Campbell J (2003) Castings, 2nd edn. Elsevier Butterwort-Heinemann, OxfordGoogle Scholar
  6. 6.
    Alexopoulos ND, Tiryakioğlu M (2009) Relationship between fracture toughness and tensile properties of A357 cast aluminum alloy. Metall Mater Trans A 40:702–716CrossRefGoogle Scholar
  7. 7.
    Tiryakioglu M, Staley JT, Campbell J (2004) Evaluating structural integrity of cast Al-7%Si-Mg alloys via work hardening characteristics: II. A new quality index. Mater Sci Eng A 368:231–238CrossRefGoogle Scholar
  8. 8.
    Kuang JH, Chen YC (1996) The values of J-integral within the plastic zone. Eng Fract Mech 55:869–881CrossRefGoogle Scholar
  9. 9.
    Tiryakioglu M, Campbell J, Alexopoulos N (2009) Quality indices for aluminum alloy castings: a critical review. Metall Mater Trans B 40:802–811CrossRefGoogle Scholar
  10. 10.
    Drouzy M, Jacob S, Richard M (1980) Interpretation of tensile results by means of quality index and probable yield strength. AFS Int Cast Met J 5:43–50Google Scholar
  11. 11.
    Cáceres CH (1998) A rationale for the quality index of Al-Si-Mg casting alloys. Int J Cast Met Res 10:293–299CrossRefGoogle Scholar
  12. 12.
    Cáceres CH, Makhlouf M, Apelian D, Wang L (2001) Quality index chart for different alloys and temperatures: a case study on aluminium die-casting alloys. J Light Met 1:51–59CrossRefGoogle Scholar
  13. 13.
    Tiryakioglu M, Staley JT, Campbell J (2008) The effect of structural integrity on the tensile deformation characteristics of A206-T71 alloy castings. Mater Sci Eng A 487:383–387CrossRefGoogle Scholar
  14. 14.
    Tiryakioglu M, Campbell J, Staley JT (2004) Evaluating structural integrity of cast Al-7% Si-Mg alloys via work hardening characteristics: 1. Concept of target properties. Mater Sci Eng A 368:205–211CrossRefGoogle Scholar
  15. 15.
    Olofsson J (2018) Local microstructure-based material performance and damage in design and finite element simulations of cast components. J Comput Des Eng (in press)Google Scholar
  16. 16.
    Olofsson J, Svensson IL (2012) Incorporating predicted local mechanical behaviour of cast components into finite element simulations. Mater Des 34:494–500CrossRefGoogle Scholar
  17. 17.
    Bjurenstedt A, Seifeddine S, Jarfors AEW (2015) On the complexity of the relationship between microstructure and tensile properties in cast aluminum. Int J Mod Phys B 29Google Scholar
  18. 18.
    Olofsson J, Svensson IL, Lava P, Debruyne D (2014) Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation. Mater Des 56:755–762CrossRefGoogle Scholar
  19. 19.
    Seifeddine S, Johansson S, Svensson IL (2008) The influence of cooling rate and manganese content on the β-Al5Si phase formation and mechanical properties of Al-Si based alloys. Mater Sci Eng A 490:385–390CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Jakob Olofsson
    • 1
    Email author
  • Anton Bjurenstedt
    • 2
  • Salem Seifeddine
    • 1
  1. 1.School of EngineeringJönköping UniversityJönköpingSweden
  2. 2.Swerea SWECASTJönköpingSweden

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