**5. Conclusions**

#### **5.1 Die casting**

The fluidity of the Al-Mg alloy decreased with increasing Mg content until 6% Mg and then increased as the Mg content was increased beyond 6%. The fluidity was greatest at an Mg content of 10% and progressively decreased at contents of 4.5%, 8%, and 6%. The fluidity increased with increasing Fe content.

The tensile strength and the 0.2% proof stress increased with increasing Mg content. The elongation of the Al-6%Mg was greater than that of the Al-4.5%Mg. The addition of Fe did not degrade the tensile stress and the 0.2% proof stress. The elongation was reduced by the addition of Fe. The elongations of the Al-4.5%Mg with 0.8%Fe and Al-6%Mg with 0.8%Fe were 10% and 8%, respectively. These elongations were as good as those obtained during die casting. The amount of decrease in the elongation of the Al-4.5%Mg was smaller than that of the Al-6%Mg. The Al-4.5%Mg is suitable for recycling when the recycled alloy was die-cast.
