Abstract
Aluminium-copper of (99.99%) high purity eutectic alloy was melted in a graphite crucible under vacuum atmosphere. This eutectic alloy was directionally solidified upward with a constant growth rate V, and different temperature gradients G, and also with a constant temperature gradient and different growth rates in the Bridgman type directional solidification furnace. The lamellar spacings λ E were measured from both transverse section and longitudinal section of the specimen. The undercooling values ΔT were obtained by using growth rate and system parameters K 1 , K 2 . It was found that the values of λ E decreased as V, G and GV values are increased. The relationships between lamellar spacing λ E and solidification parameters, V, G and GV were obtained by Least squares analysis. Bulk growth rate λ E 2 V was determined by using λ E values for both the transverse section and the longitudinal section. The experimentally obtained values found were in good agreement with theoretical values.
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