Study on Ag-Cu₂₈ alloys synthesized by mechanical alloying

Ag-Cu₂₈ eutectic alloys have been prepared by mechanical alloying with mixed powders of Ag and Cu. The effects of milling speed, ball-to-powder weight radio and PCA on alloying process have been studied by orthogonal experiment. The phase compositions, microstructures and melting properties of the powders were studied by XRD, SEM and TG-DSC. The results show that Ag-Cu supersaturated solid solution alloys can be obtained by milling powders of Ag and Cu for 30h. The lowest melting point is 783.8°C. Ag-Cu₂₈ alloy is metastable state, the composition of alloy is Ag-rich and Cu-rich phase after aging treatment. The steari acid as PCA can refine powder size effectively, but it is a disadvantage factor for alloying.