Mechanical alloying (MA) is known as a non-equilibrium materials processing technique. The final structure obtained by MA for a given alloy system depends on milling conditions. In this study, the mechanical alloying behaviour of Cu50Zr43Al7 alloy is studied. The solid state reactions and structural changes occurred during milling in different mill machines including low-energy planetary, Spex (shaker) and high-energy planetary mills are investigated. The structure and phase composition of milled powders are characterized by X-ray diffraction. The results indicate that low-energy planetary mill with input energy of 1440 J.s/g led to a Cu-rich solid solution. With increasing of milling intensity to 4320 J.s/g in Spex (shaker) ball mill, nanostructured Cu-rich solid solution and Zr2Al3 intermetallic compound are formed. Final products of milling in high-energy planetary mill with input energy of 4564 J.s/g are nanocrystalline Zr2Al3 and Cu10Zr7 intermetallic compounds.
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