Macro-segregation is an irreversible defect in non-ferrous alloy casts. This can only be
significantly minimized by controlling the melt and its flow trajectory during casting. The study
identified runner angle inclination as a critical parameter that impacts the development, size
and volume of macro-segregation occurrence in binary alloys. The methodology entails
variation of runner angles to include 90°, 105°, 120°, 135°, and 150° at a constant casting speed
of 100mm/s being the optimum casting speed established in previous study. The casts
microstructure was examined using both optical and electron microscopes complemented with
energy dispersive spectrometry. Results show that runner position at 120° is the most
appropriate for the casting of aluminium-zinc alloy as this gave a highly homogeneous
distribution of solute element in the microstructure with corresponding improved mechanical
properties.