The Magnesium & Manganese Content in Aluminum Alloy

Alumunum die cast alloys are typically comprised of various constituents which effect the overall characteristics of the alloy

Magnesium- is usually controlled at a low level (.1%) in many of the popular die cast alloys in order to minimize brittleness and loss of ductility.

Manganese- is a desirable alloying element in increasing strength and ductility of aluminum alloys. In small additions, manganese combines with iron to change the iron-rich phases in the microstructure from needle-like, brittle precipitates to more ductile plates or “broken needles” in random orientation. Manganese must be carefully balanced with iron content (necessary to prevent soldering) to avoid sludge formation, the latter being a complex containing iron, manganese, and chromium.