Attributes . 0.25% Silicon (Si), 0.40% Iron (Fe), 0.10% Copper (Cu), 0.05 - 0.20% Manganese (Mn), 4.5 - 5.5% Magnesium (Mg), 0.05 - 0.20% Chromium (Cr), 0.1% Zinc (Zn), 0.06 - 0.20% Titanium (Ti), 0.15% Other, 0.0008% Be, Rem% Aluminum (Al) . Names