Solid-state reaction of Al/CuO couple by high-energy ball milling

The solid state reaction of Al/CuO induced by high-energy ball milling was studied systematically. When the amount of Al was 20 wt%, only reduction occurred. When the amount of Al exceeded 20 wt%, along with the reduction, a synthesis reaction occurred simultaneously. As the amount of Al increased, the reaction products were Cu9Al4, CuAl2 or a Al(Cu) solid solution, respectively. The mechanism of these two types of reactions occurring during ball milling is discussed.