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Effect of growth rates and temperature gradients on the spacing and undercooling in the broken-lamellar eutectic growth (Sn-Zn eutectic system)

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Abstract

The Sn-Zn system has a eutectic structure of a broken lamellar type. Dependence of the broken-lamellar spacing λ and the undercooling ΔT on V and G were investigated, and the relationship between them was examined. A Sn-Zn (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 (8.30 µm/s) and different temperature gradients G (1.86–6.52 K/mm), and also with a constant temperature gradient (6.52 K/mm) and different growth rates (8.30–165.13 µm/s) in a Bridgman-type directional solidification furnace. The lamellar spacings λ were measured from both transverse and longitudinal sections of the specimen. The λ values from the transverse section were used for calculations and comparisons with the previous works. The undercooling values ΔT were obtained using growth rate and system parameters K 1 and K 2. It was found that the values of λ decreased while V and G increased. The relationships between lamellar spacing λ and solidification parameters V and G were obtained by linear regression analysis method. The λ2 V, ΔTλ, ΔTV −5, and λ3 G values were determined using λ, ΔT, V, and G values. The experimentally obtained values for the broken-lamellar growth (Sn-Zn eutectic system) were in good agreement with the theoretical and other experimental values.

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Authors and Affiliations

  1. Faculty of Arts and Sciences, Department of Physics, Niğde University, Niğde, Turkey

    H. Kaya & E. Çadırlı

  2. Erciyes University, Kayseri, Faculty of Arts and Sciences, Department of Physics, Turkey

    M. Gündüz

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  1. H. Kaya
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  2. E. Çadırlı
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  3. M. Gündüz
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Kaya, H., Çadırlı, E. & Gündüz, M. Effect of growth rates and temperature gradients on the spacing and undercooling in the broken-lamellar eutectic growth (Sn-Zn eutectic system). J. of Materi Eng and Perform 12, 456–469 (2003). https://doi.org/10.1361/105994903770343024

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  • DOI: https://doi.org/10.1361/105994903770343024

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