, Volume 49, Issue 2, pp 29–33 | Cite as

The effect of preaging on the delayed aging of Al−7Si−0.3Mg

  • S. Murali
  • Y. Arunkumar
  • P. V. J. Chetty
  • K. S. Raman
  • K. S. S. Murthy
Aluminum Research Summary


Al−7Si−0.3Mg is a commonly used commercial casting alloy because of its excellent castability combined with good mechanical properties. The post-casting heat treatment isone factor that affects the mechanical properties; during heat treatment, a delay between solutionizing and artificial aging (delayed aging) leads to a reduction in hardness, ultimate tensile strength, and yield strength in the alloy. The investigation reported here was aimed at understanding the extent to which the harmful effect of delayed aging on hardness/strenght can be nullified. The results obtained were explained using Pashley’s kinetic model.


Ultimate Tensile Strength Aging Temperature Artificial Aging Preaging Treatment Trace Addition 
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  1. 1.
    S. Murali, K.S. Raman, and K.S.S. Murthy, “Effect of Cd Trace Addition on Delayed Aging of the Al-7Si-0.3Mg Casting Alloy,”Aluminum, 69(5) (1993), pp. 466–469.Google Scholar
  2. 2.
    M. Tsukuda, S. Koike, and K. Asano, “Effect of Preaging at Room Temperature on the Mechanical Properties of Al-7Si-Mg Casting Alloy,”J. Jpn. Inst. Light Met., 28 (11) (1978), pp. 531–540.Google Scholar
  3. 3.
    D.W. Pashley, J.W. Rhodes, and A. Sendorek, “Delayed Aging in Al−Mg−Si Alloys: Effect on Structure and Mechanical Properties,”J. Inst. Met., 94 (1966), pp. 41–49.Google Scholar
  4. 4.
    D.W. Pashley, M.H. Jacobs, and J.T. Vietz, “A Kinetic Model on Two Step Aging Process of Age Hardenable Alloys,”Philos. Mag., 16 (1967), pp. 51–76.CrossRefGoogle Scholar
  5. 5.
    G.P. Ghate, K.S.S. Murthy, and K.S. Raman, “Effect of Trace Elements on the Delayed Aging of Al-7%Si-0.3%Mg Alloy,”Aluminum, 60(1) (1984), pp. 18–19.Google Scholar
  6. 6.
    S. Murali et al., “Inhibition of Delayed Aging by Trace Additions in Al-7Si-0.3Mg Cast Alloy,”Scr. Metall. et Mat. 29(11) (1993), pp. 1421–1427.CrossRefGoogle Scholar
  7. 7.
    K.T. Kashyap et al., “Overview, Casting and Heat Treatment Variables of Al-7Si-Mg Alloy,”Mat. Sci. Tech., 9 (1993), pp. 189–203.Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 1997

Authors and Affiliations

  • S. Murali
  • Y. Arunkumar
  • P. V. J. Chetty
  • K. S. Raman
  • K. S. S. Murthy

There are no affiliations available

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