Al-Mg alloy powders were produced in the form of nanocrystalline dendrites using the galvanostatic electrodeposition technique. Two distinct morphologies namely, featherlike and globular, were observed under the employed deposition conditions. The featherlike morphology consisted of only the face-centered cubic (fcc)-Al(Mg) phase. However, the globular morphology was composed of the hexagonal close-packed (hcp)-Mg(Al) phase as well as the fcc-Al(Mg) phase. Compositional and TEM studies revealed that both phases were supersaturated and exhibited a nanocrystalline microstructure. Short-time potentiostatic experiments revealed that the formation of these morphologies is dependent on the applied overpotential such that at high overpotentials, only the globular morphology develops, whereas at low overpotentials, only the featherlike morphology is created. These observations are discussed in terms of the deposition rate. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3468939] All rights reserved.