Abstract
Interdendritic eutectic microstructures in Al-Si (6 to 12.6 wt pct Si) alloys have been investigated as a function of growth velocity and temperature gradient. The interface morphology, as well as the behavior of the eutectic spacing and undercooling, suggest that the resultant microstructure is governed by two different growth processes. That is, at low growth rates, steady-state columnar eutectic growth is found and obeys the relationship, λ2V = constant, where λ is the eutectic spacing andV is the growth rate. At higher growth rates, the nucleation of equiaxed eutectic grains occurs in the interdendritic liquid. The experimental findings are interpreted in the light of recently developed models for the columnar to equiaxed transition and for irregular eutectic growth.
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References
D. Mietrach and J. Weilke:Aluminium, 1982, vol. 58, p. 157.
R. Elliott:Eutectic Solidification Processing, Butterworths, 1983, London.
M. G. Day and A. Hellawell:Proc. Roy. Soc. A, 1968, vol. 305, p. 473.
H. A. H. Steen and A. Hellawell:Acta Metall., 1972, vol. 20, p. 363.
L. Vandenbulcke and G. Vuillard:J. Cryst. Growth, 1972, vol. 12, pp. 137 and 145.
A. J. McLeod, L. M. Hogen, C. McL. Adam, and D. C. Jenkinson:J. Cryst. Growth, 1973, vol. 19, p. 301.
H. A. H. Steen and A. Hellawell:Acta Metall., 1975, vol. 23, p. 529.
B. Toloui and A. Hellawell:Acta Metall., 1976, vol. 24, p. 565.
R. Elliott and S. M. D. Glenister:Acta Metall., 1980, vol. 28, p. 1489.
O. A. Atasoy, F. Yilmaz, and R. Elliott:J. Cryst. Growth, 1984, vol. 66, p. 137.
H. A. Gruber, F. Jeglitsch, and W. Köck:Z. Metallkde., 1984, vol. 75, p. 341.
V.deL. Davies and J.M.West:J.Inst..Metals, 1963, vol. 92, p. 175.
M. G. Day and A. Hellawell:J. Inst. Metals, 1967, vol. 95, p. 37.
M. F.X. Gigliotti and G. A. Colligan:Metall. Trans., 1972, vol. 3, p. 933.
H. Fredriksson, M. Hillert, and N. Lange:J. Inst. Metals, 1973, vol. 101, p. 285.
P. C. Jenkinson and L. M. Hogan:J. Cryst. Growth, 1975, vol. 28, p. 171.
S. M. D. Glenister and R. Elliott:Metal Sci., 1981, p. 181.
N. Eustathopoulos and S. Bercovici:Mém. Scient. Rev. Métall., 1984, p. 625.
E. Scheil:Giesserei, 1959, vol. 24, p. 1313.
G. A. Chadwick: inThe Solidification of Metals, The Iron and Steel Institute, London, 1968, p. 138.
W. Kurz and D. J. Fisher:Intern. Met. Rev., 1979, p. 177.
E. Blank and M. Rappaz: inComportement plastique des solides anisotropes, J. P. Boehler, ed., Colloques intern. CNRS No 319, 1982, Edition du CNRS Paris, 1985, p. 257.
E. Blank, W. Kurz, and M. Rappaz:Helvetica Phys. Acta, 1985, vol. 58, p. 469.
K. A. Jackson and J. D. Hunt:TMS-AIME, 1966, vol. 236, p. 1129.
J. D. Hunt:Mater. Sci. Eng., 1984, vol. 65, p. 75.
D. J. Fisher and W. Kurz:Acta Metall., 1980, vol. 28, p. 777.
W. Kurz and D. J. Fisher:Fundamentals of Solidification, Trans. Tech. Publications, 4711 Aedermannsdorf, Switzerland, 1984.
H. Jones and W. Kurz:Z. Metallkde., 1981, vol. 72, p. 792.
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Grugel, R., Kurz, W. Growth of interdendritic eutectic in directionally solidified Al-Si alloys. Metall Trans A 18, 1137–1142 (1987). https://doi.org/10.1007/BF02668564
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DOI: https://doi.org/10.1007/BF02668564