Nickel Magnesium Alloy is a nickel alloy containing magnesium with Iron and Rare Earth Metal. It is used as a spheroidizer in ductile iron. The presence of rare earth metals such as cerium eliminates the harmful effect caused by the presence of impurities including Ti, Bi, Sb and Pb. Moreover, the presence of Ce (MM) improves the spheronization effect of magnesium and extends the duration of action of magnesium.