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    Directional solidification of the aluminum-copper eutectic alloy
    (Japan Inst of Metals, Sendai, Japan, 1999) Cadirli E.; Ulgen A.; Gunduz M.
    Aluminum-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 ?E were measured from both transverse section and longitudinal section of the specimen. The undercooling values ?T were obtained by using growth rate and system parameters K1, K2. It was found that the values of ?E decreased as V, G and GV values are increased. The relationships between lamellar spacing ?E and solidification parameters, V, G and GV were obtained by Least squares analysis. Bulk growth rate ?E 2V was determined by using ?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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    Microstructural evolution and mechanical properties of Sn-Bi-Cu ternary eutectic alloy produced by directional solidification
    (Universidade Federal de Sao Carlos, 2018) Sahin M.; Sensoy T.; Cadirli E.
    Sn-36Bi-22Cu (wt.%) ternary eutectic alloy was prepared using vacuum melting furnace and casting furnace. The samples were directionally solidified upwards solidification rate varying from 8.3 to 166 µm/s and at a constant temperature gradient (4.2 K/mm) in a Bridgman-type directional solidification furnace. The composition analysis of the phases and the intermetallics (Cu3Sn and Cu6Sn5) were determined from EDX and XRD analysis respectively. The variation of the lamellar spacing (Bi-rich phase) and the Cu3Sn phase spacing with the solidification rate were investigated. The dependence of microhardness, ultimate compressive strength and compressive yield strength on solidification rate were determined. The spacing and microhardness were measured from both longitudinal and transverse sections of the samples. The dependence of microhardness on the lamellar spacing and the Cu3Sn phase spacing were also determined. The relationships between phase spacings, solidification rate and mechanical properties were determined from linear regression analysis. © 2018 Universidade Federal de Sao Carlos. All rights reserved.