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Abstract
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In current research, the interactive effects of different parameters such as melt overheating temperature, the location of gating system and incorporation of the grain refiner, in bar and micro-powder form on the mechanical and structural characteristics of commercially pure aluminium are examined. Results show that increasing the melt temperature as well as employing a gating system with higher heat transfer rate increases the ultimate tensile strength (UTS) of the pure aluminium by 7%. Also, the introduction of 2%wt Al-5Ti-1B grain refiner in bar form into the overheated melt enhances the UTS values by two times, while incorporating 2%wt Al-5Ti-1B grain refiner in micro-powder form leads to achieving 32% higher UTS compared to the samples with grain refiner in the bar form due to the elimination of Al3Ti brittle phase, as confirmed by XRD patterns and SEM fracture surface images.
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