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Complex concentrated alloy (CCA) with a nominal composition Al0.4CoCr1.3FeNi1.3(Si, Ti, C, B)0.4 was prepared at two different solidification conditions. Centrifugal casting (CC) of the CCA was applied due to the turbulent filling of a graphite mould at non-steady solidification conditions and directional solidification (DS) was performed at steady-state solidification conditions. Directional solidification was carried out in a Bridgman-type apparatus at a constant growth rate of 1.39 x 10-5 m·s-1 and a constant temperature gradient in liquid. Both types of ingots were subjected to microstructural analysis using light microscopy (LM) and scanning electron microscopy (SEM). The chemical composition of the coexisting phases was measured by energy-dispersive spectrometry (EDS). Segregation of Al, Si, Ti, B and C to the interdendritic region during solidification leads to the formation of several interdendritic phases identified in the ingots. The effect of solidification conditions on the size of dendrites and interdendritic phases was evaluated. Isothermal annealing at 1260 °C leads to the melting of all interdendritic phases. Effective partition coefficients of alloying elements were calculated from the measured chemical composition of dendrites and interdendritic region in samples annealed at 1260 °C for 1 h followed by water quenching.
Keywords: Complex concentrated alloys, solidification, microstructure, segregation© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.