Study of the Mechanism of Mechanical Alloying for Mg-Cu Amorphous Alloy Formation

The structure of the MgCu_ 2 and Mg_ 58Cu_ 42 amorphous powders, prepared by mechanical alloying after different milling times, had been studied by XRD and TEM in this paper. The results showed that Mg and Cu powders could dissolve into each other and the dissolution degree became larger after milling. During the milling process, Mg powders firstly dissolved into the gap of Cu crystal lattice and the solid solution with Mg supersaturation was formed. Then, the energy of supersaturation became large enough to break its stability, and the amorphous alloy was obtained at the end. At the same weight ratio of ball-to-powder, enhancing the velocity of milling could accelerate the amorphization process.