Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
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.
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.
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.
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.
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.
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.
K.T. Kashyap et al., “Overview, Casting and Heat Treatment Variables of Al-7Si-Mg Alloy,”Mat. Sci. Tech., 9 (1993), pp. 189–203.
Additional information
S. Murali earned his Ph.D. in physical and mechanical metallurgy from the Indian Institute of Science (Metallurgy Department) in 1994. He is currently a postdoctoral fellow at the Indian Institute of Science.
Y. Arunkumar earned his M.E. in mechanical engineering from the Indian Institute of Science in 1993. He is currently a lecturer at Malnad Engineering College, India.
P.V.J. Chetty earned his M.E. in metallurgical engineering from the Indian Institute of Science in 1993. He is currently manager of Mineral Pulverising Mills in India.
K.S. Raman earned his Ph.D. in mechanical metallurgy from the Indian Institute of Science in 1970. He is currently a professor in the Department of Metallurgy at the Indian Institute of Science.
K.S.S. Murthy earned his Ph.D. in foundry metallurgy from the Indian Institute of Science in 1969. He is currently a professor in the mechanical engineering department at the Indian Institute of Science.
Rights and permissions
About this article
Cite this article
Murali, S., Arunkumar, Y., Chetty, P.V.J. et al. The effect of preaging on the delayed aging of Al−7Si−0.3Mg. JOM 49, 29–33 (1997). https://doi.org/10.1007/BF02915475
Issue Date:
DOI: https://doi.org/10.1007/BF02915475