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In the present work, the effect of growth rate and temperature gradient on   microstructure and mechanical properties of Zn-7wt.%Al-4wt.%Cu eutectic alloy   has been investigated. Alloys prepared under steady-state conditions by   vacuumed hot filing furnace. Then, the alloys were directionally solidified   upward with different growth rates (V=11.62-230.77 mm/s) at a constant   temperature gradient (G=7.17 K/mm) and with different temperature gradients   (G=7.17-11.04 K/mm) at a constant growth rate (V=11.62 mm/s) by a Bridgman   furnace. The microstructures were observed to be lamellae of Zn, Al and   broken lamellae CuZn4 phases from quenched samples. The values of eutectic   spacing, microhardness and ultimate tensile strength of alloys were measured.   The dependency of the microstructure and mechanical properties on growth rate   and temperature gradient were investigated using regression analysis

Directional solidification of Zn-Al-Cu eutectic alloy by the vertical Bridgman method