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TURKISH PHYSICAL SOCIETY 39th INTERNATIONAL PHYSICS CONGRESS, Muğla, Turkey, 31 August - 04 September 2023, pp.164
The aim of this study is to examine the effect on the electrical and mechanical properties of Fe element added to Al–32.5 wt% Cu eutectic alloy. In the first step of the experimental stages, Al–32.5 wt % Cu– X wt % Fe (X=0.3, 0.8 and 1.0) alloys were prepared using high purity metals (>99.00%) in a specially designed vacuum furnace. Al–Cu–Fe alloys, which started to attract more attention with the discovery of stable quasi-crystalline phases in the literature, were carried out directional solidification experiments under an argon atmosphere using Bridgman-type directional solidification apparatus at a constant growth rate (8.47 μm s-1) and different temperature gradients (7.65, 8.76, 9.17 K mm-1). The samples were solidified up to 10-13 cm in length to ensure that the steady-state condition was obtained and then quenched. After the solidification experiments, each sample was examined metallurgically, and electrical resistivity (ρ), microhardness (HVT), and ultimate tensile strength (σ) values were measured. Phase characterization was performed with the Bruker-D8 DISCOVER X-ray diffraction (XRD) instrument. As a result, considering the ternary eutectic point (L=>(Al) + Al2Cu-Al7Cu2Fe) given in the phase diagram, it was seen that the distance between the Al2Cu and Al7Cu2Fe phases decreased and a more complex microstructure emerged. Moreover, measurements showed us that the Fe element improves the mechanical properties in the ternary eutectic alloy, but the conductivity decreases due to the increase in electrical resistivity. The resulting data were compared with previous Al-based and Al-Cu-based alloys that solidified under similar growth conditions.