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The present study focuses on the effect of alloying elements, namely, strontium, titanium, zirconium, scandium and silver, individually or in combination, on the performance of a newly developed Al-2 %Cu-based alloy. A total of thirteen alloy compositions were used in the study. Castings were prepared employing the low pressure die casting technique. The microstructures of selected samples were examined using optical microscopy and electron probe microanalysis. Hardness measurements were also carried out on these alloys using a Brinell hardness tester. The results showed that adding Ti in the amount of 0.15 wt.% in the form of Al-5 %Ti-1 %B master alloy is sufficient to refine the grains in the cast structure in the presence of 200 ppm Sr (0.02 wt.%). Addition of Zr and Sc did not contribute further to the grain refining effect. The main role of addition of these two elements appeared in the formation of complex compounds with Al and Ti. The results obtained from the low pressure die casting samples were compared with those produced using traditional gravity die casting. No heat treatment was applied.

Microstructural evolution during solidification of Al–Cu-based alloys