Abstract
A columnar-to-equiaxed transition is observed in Al 3 pct Cu solidified directionally from a chill face. The transition occurs when the temperature gradient in the melt ahead of the columnar dendrites decreases to 0.6 ‡C/cm at dendrite growth rates of about 5 x 10-3 cm/s. Increasing the nuclei density by adding 171 ppm of TiB2 to the melt produces a fine-grained structure without columnar growth. Adding 100 ppm TiB2 has no effect on the cast structure or columnar-to-equiaxed transition. The results are considered in relation to the model for the columnar-to-equiaxed transition proposed by Hunt.[2]
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References
R.B. Mahapatra and F. Weinberg:Metall. Trans. B, 1987, vol. 18B, pp. 425–32.
J.D. Hunt:Mater. Sci. Eng., 1984, vol. 65, pp. 75–83.
M.H. Burden and J.D. Hunt:J. Cryst. Growth, 1974, vol. 22, pp. 99–108. $
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Ziv, I., Weinberg, F. The columnar-to-equiaxed transition in Al 3 Pct Cu. Metall Trans B 20, 731–734 (1989). https://doi.org/10.1007/BF02655931
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DOI: https://doi.org/10.1007/BF02655931