Abstract
The influence of solution heat treatment parameters on T6 properties of unmodified and Sr-modified A356.2 alloys has been studied. The effects of solution temperature and time were investigated with ASTM B 108 test bars cast in sand molds and in permanent molds. Metallographic and image analysis techniques have been utilized to examine the microstructural changes occurring during heat treatment. The results indicate that the effect of Sr modification is to increase the spheroidization rate and lower the coarsening rate of Si particles. The solution temperature has a strong influence on Si particle morphology. Extremely high coarsening rates can be obtained at temperatures greater than 560° C. Solution treatment at these temperatures, however, has a detrimental effect on mechanical properties because of grain boundary melting. It has been established that solution times can be reduced significantly in modified samples. Increasing the solution temperature from 540 to 550°C enhances the strength properties.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Metals Handbook, Volume 15, Ninth edition, American Society for Metals, 1988.
D. Apelian, S. Shivkumar, and G. Sigworth,Trans AFS, 1989,97, pp. 727–742.
B.A. Parker, D.S. Saunders, and J.R. Griffiths,Metals Forum, 1982, 5(1), pp. 48–53.
F.N. Rhines and M. Aballe,Met Trans A, 1986,17A, pp. 2139–2152.
M.M. Tuttle and D.L. Mclellan,Trans AFS, 1982,90, pp. 13–23.
H.J. Li, S. Shivkumar, X.J. Luo, and D. Apelian,Cast Metals, 1989,1(4), pp. 227–234.
M. Adachi,Alutopia(Jpn.), 1984,14(12), pp. 16–22.
E. Mauveaux and M. Lafargi,Trait. Therm., 1982,169, pp. 31–35.
S. Shivkumar, S. Ricci, Jr., B. Steenhoff, D. Apelian, and G. Sigworth,Trans AFS, 1989,97, pp. 791–810.
J.W. Martin and R.D. Doherty:Stability of Micro-structures in Metallic Systems, Cambridge University Press, London, 1980.
I.M. Liftshitz and V.V. Sloyozov,J. Phys. Chem. Solids, 1961,19, pp. 35–47.
B. Closset, R.A.L. Drew and J.E. Gruzleski,Trans AFS, 1986,94, pp. 9–16.
M.H. Mulazimoglu, R.A.L. Drew, and J.E. Gruzleski,Met Trans A, 1987,18A, pp. 941–947.
J.A. Eady and D.M. Smith,Materials Forum, 1986,9(4), pp. 217–223.
D.M. Smith and J.A. Eady, “Metals in Mining” [Proc. Conf.], Australian Inst. of Mining, 1981, pp. 78–81.
M. Tsukuda, S. Koike, and M. Harada,J. of Japan Inst, of Light Metals, 1978,28(1), pp. 8–14.
M. Kaczorowski and R. Szostak,Aluminium, 1983,59, pp. 304–306.
P. Murza-Mucha, R. Szostak,J. of Materials Science, 1972,17, pp. 3621–3629.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shivkumar, S., Ricci, S., Keller, C. et al. Effect of solution treatment parameters on tensile properties of cast aluminum alloys. J. Heat Treating 8, 63–70 (1990). https://doi.org/10.1007/BF02833067
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02833067