Directional solidification and physical properties measurements of the zinc-aluminum eutectic alloy |
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Authors: | S. Engin U. Byük H. Kaya N. Marash |
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Affiliation: | 1. Department of Physics, Institute of Science and Technology, Erciyes University, Kayseri 38039, Turkey 2. Department of Science Education, Faculty of Education, Erciyes University, Kayseri 38039, Turkey 3. Department of Physics, Faculty of Science, Erciyes University, Kayseri 38039, Turkey |
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Abstract: | Zn-5wt% Al eutectic alloy was directionally solidified with different growth rates (5.32-250.0 tm/s) at a constant temperature gradient of 8.50 K/mm using a Bridgman-type growth apparatus.The values of eutectic spacing were measured from transverse sections of the samples.The dependences of the eutectic spacing and undercooling on growth rate are determined as λ=9.21 V-0.53 and △T=0.0245 V0.53,respectively.The results obtained in this work were compared with the Jackson-Hunt eutectic theory and the similar experimental results in the literature.Microhardness of directionally solidified samples was also measured by using a microhardness test device.The dependency of the microhardness on growth rate is found as Hv=115.64V0.13.Afterwards,the electrical resistivity (r) of the casting alloy changes from 40× 10-9 to 108× 10-9 Ω·m with the temperature rising in the range of 300-630 K.The enthalpy of fusion (△H) and specific heat (Cp) for the Zn-Al eutectic alloy are calculated to be 113.37 J/g and 0.309 J/(g.K),respectively by means of differential scanning calorimetry (DSC) from heating trace during the transformation from liquid to solid. |
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Keywords: | eutectic alloys directional solidification microhardness electrical conductivity enthalpy specific heat |
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