Abstract
The precipitation of silicon in aluminum-silicon was investigated by calorimetric analysis of liquid-quenched (LQ; rapidly solidified) and solid-quenched (SQ: quenched after annealing the solid at elevated temperature) alloys. Nonisothermal annealing experiments (differential scanning calorimetry) were performed using specimens containing 1.3 to 19.1 gross at. pct Si. Initial and resulting microstructures were characterized by X-ray diffraction and transmission electron microscopy. Quantitative analysis showed that heat production in LQ alloys is due to precipitation of dissolved silicon and coarsening of silicon particles already present in the as-liquidquenched state, whereas heat production in SQ alloys can be ascribed solely to precipitation. The kinetics of silicon precipitation are affected by quenched-in excess vacancies in both LQ and SQ alloys. The grain-boundary area as a function of gross silicon content is discussed in terms of its effect on vacancy annihilation and the resulting effective activation energy.
Similar content being viewed by others
References
T.R. Anantharaman and C. Suryanarayana:Rapidly Solidified Metals, Trans. Tech. SA, Aedermannsdorf, Switzerland, 1987, pp. 1–4.
A. Bendijk, R. Delhez, L. Katgerman, Th.H. de Keijser, E.J. Mittemeijer, and N.M. van der Pers:J. Mater. Sci., 1980, vol. 15, pp. 2803–10.
R. Delhez, Th.H. de Keijser, E.J. Mittemeijer, P. van Mourik, N.M. van der Pers, L. Katgerman, and W.E. Zalm:J. Mater. Sci., 1982, vol. 17, pp. 2887–94.
P.H. Shingu, K. Kobayashi, K. Shimomura, and R. Ozaki:J. Jap. Inst. Metall., 1973, vol. 37, pp. 433–40.
P. van Mourik, Th.H. de Keijser, and E.J. Mittemeijer:Proc. 5th Int. Conf. Rap. Quenched Metals, S. Steeb and H. Warlimont, eds., Würzburg, F.R.G., Sept. 3-7, 1984, pp. 899-902.
P. van Mourik, E.J. Mittemeijer, and Th.H. de Keijser:J. Mater. Sci., 1983, vol. 18, pp. 2706–20.
P. van Mourik, Th.H. de Keijser, and E.J. Mittemeijer:Proc. 1st Int. Conf. on Rapidly Solidified Materials, San Diego, CA, Feb. 3–5, 1986, P.W. Lee and R.S. Carbonara, eds., ASM, Metals Park, OH, 1986, pp. 341-50.
I. Yamauchi, I. Ohnaka, S. Kawamoto, and T. Fukusako:Trans. Jap. Inst. Metall., 1986, vol. 27, pp. 187–94.
K. Kobayashi, M. Kumikawa, and P.H. Shingu:J. Jap. Inst. Metall., 1985, vol. 49, pp. 59–63.
M. van Rooyen, J.A. Sinte Maartensdijk, and E.J. Mittemeijer:Metall. Trans. A, 1988, vol. 19A, pp. 2433–43.
M. van Rooyen, J.A. van der Hoeven, L. Katgerman, P. van Mourik, Th.H. de Keijser, and E.J. Mittemeijer:Proc. P.M. Aerospace Mater. Conf., Metal Powder Report, ed., Berne, Switzerland, Nov. 1984, vol. 1, pp. 34-1-16.
J.L. Murray and A.J. McAlister:Bull. Alloy Phase Diagr., 1984, vol. 5, pp. 74–84.
M. van Rooyen, N.M. van der Pers, L. Katgerman, Th.H. de Keijser, and E.J. Mittemeijer:Proc. 5th Int. Conf. Rap. Quenched Metals, S. Steeb and H. Warlimont, eds., Würzburg, F.R.G., Sept. 3-7, 1984, pp. 823-26.
J.W. Christian:The Theory of Transformations in Metals and Alloys, 2nd ed., Pergamon Press, Oxford, 1975, part I.
M.A.J. Somers, R.M. Lankreijer, and E.J. Mittemeijer:Phil. Mag., 1989, vol. 59, pp. 353–78.
Metals Reference Book, 5th ed., C.J. Smithells, ed., Butterworth’s, London, 1976.
E.J. Mittemeijer, P. van Mourik, and Th.H. de Keijser:Phil. Mag. A, 1981, vol. 43, pp. 1157–64.
P. van Mourik, Th.H. de Keijser, and E.J. Mittemeijer:Scripta Metall., 1987, vol. 21, pp. 381–85.
K. Kobayashi, P.H. Shingu, H. Kanbara, and R. Ozaki:Trans. Jap. Inst. Metall., 1976, vol. 17, pp. 545–50.
E.J. Mittemeijer, Liu Cheng, P.J. van der Schaaf, C.M. Brakman, and B.M. Korevaar:Metall. Trans. A, 1988, vol. 19A, pp. 925–32.
E.J. Mittemeijer, A. van Gent, and P.J. van der Schaaf:Metall. Trans. A, 1986, vol. 17A, pp. 1441–45.
H.E. Kissinger:Anal. Chem., 1957, vol. 29, pp. 1702–06.
T. Ozawa:J. Therm. Anal., 1970, vol. 2, pp. 301–24.
M.E. Bishop and K.E. Fletcher:Int. Metall. Rev., 1972, vol. 17, pp. 203–25.
R.W. Siegel:J. Nucl. Mater., 1978, vol. 69–70, pp. 117–46.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Van Rooyen, M., Mittemeijer, E.J. Precipitation of silicon in aluminum-silicon: A calorimetric analysis of liquid-quenched and solid- quenched alloys. Metall Trans A 20, 1207–1214 (1989). https://doi.org/10.1007/BF02647402
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02647402