Influence of the growth rate on Physical Properties in the Aluminum-Antimony Eutectic Alloy

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Aker A., Engin S., Yılmazer M. I., Kaya H.

International Journal of Materials Engineering and Technology, vol.9, no.1, pp.59-76, 2013 (Peer-Reviewed Journal)


Al-1.1wt.%Sb eutectic alloy was directionally solidified with different growth rates (0.008-0.152 mm/s) at a constant temperature gradient of 4.05 K/mm by using Bridgman type growth apparatus. The values ofeutectic spacing (λ) were measured from transverse sections of the samples. The dependence of eutectic spacing on the growth rate (V) was measured. The results obtained, in this work, were compared with the Jackson-Hunt eutectic theory and the similar experimental results in the literature. Measurements of microhardness (HV), ultimate tensile strength (σ) and electrical resistivity (ρ) of the directionally solidified samples were carried out. The dependence of microhardness, ultimate tensile strength and electrical resistivity on growth rate (V) was also analyzed. According to these results, it has been found that, for increasing values of V, the values of HV, σ and ρ increase. The enthalpy of fusion (ΔH) and specific heat (Cp ) for the Al-Sb eutectic alloy are calculated to be 81.73 J/g and 0.332 J/(g.K), respectively, by means of differential scanning calorimeter (DSC) from heating trace during the transformation from liquid to solid.