Publication History

This investigation studied the effect of varying magnesium percentage compositions in aluminium- magnesium alloy at a specific pouring rate of 2.5 cm/sec and a pouring temperature of 760°C. The sand cast specimens were produced in the following magnesium alloy percentage compositions; 3.33%, 6.67%, 10.00%, 13.33 % and 16.67%. The specimens were subsequently tested for quality, and properties such as hardness, compressive strength and metallographic examinations were considered. Observations and results indicated that there was reduction in grain size as the percentage composition of magnesium increased from 3.33 % to 13.33%, on the contrary the hardness and compressive strength improved with increasing percentage composition of the magnesium alloy. In the range of magnesium additions tried, the sample containing 13.33 % magnesium alloy seems to be the most favorable alloy in terms of compressive strength, hardness and grain size in the sand cast condition