Directional solidification of the aluminium-copper eutectic alloy

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