Mechanical alloying (MA) is one of the most commonly used methods in preparing metallic materials . We are especially interested its ability to produce nanostructured materials. MA has rarely been used, however, in producing magnesium-based alloys of nanostructured grains, due to the complexity of the process . In this work, high energy ball milling of elemental powders; Mg, Zn and Zr, are investigated for the MA of ZK50 alloy. Crystallite size, lattice strain, and total milling energy (required for complete alloying) are characterized using X-ray diffraction. Scanning electron microscopy is also used to determine milling time effect on powder morphology. Consolidation of the milled powders into thin sheets was conducted via hot pipe rolling at 0.4 Tm. Results obtained showed that complete alloying was achieved at 45 milling hours where the particle size reached was was less than 1 µm and crystallite size of 20 nm. References:  J. C. D. V. Michaela FOUSOVA, "MAGNESIUM-ZINC ALLOY PREPARED BY MECHANICAL ALLOYING AND SPARK PLASMA," in Metal, Czech Republic, 2014;  J. L.-S. F. C.-G. a. J. C.-M. A.F. Palacios-Lazcano, "Microstructural study of Mg-Zn alloys prepared by mechanical alloying," REVISTA MEXICANA DE FISICA, p. 72–77, 2007.