On mechanism of amorphous alloy powder Mg_(58)Cu_(42) prepared with mechanical alloying

The variation of structure and morphology of Mg_(58)Cu_(42) amorphous powders prepared with mechanical alloying processing are studied by means of XRD and SEM observation. It is shown that powder of Mg and Cu can dissolve into each other and the dissolvability becomes greater after their mechanical alloying (milling). During the milling process,powders of Mg dissolve gradually into the matrix of crystal lattice of Cu and,at the same time, the fining and moncry stalline process of their grains takes place. Further as the time elapses, the size of grain becomes gradually smaller. Then, the supersaturation of Mg in Cu and their solid solution are formed. When the energy of solid solution deformation has accumulated so greatly that the crystalline structure of the solid solution becomes unstable, the amorphous alloy powder with uniformly distributed Mg and Cu is eventually formed. and the amorphous alloy is obtained at the end.