Abstract: Disclosed are methods for fabricating three-dimensional objects including providing a dry powder bed containing a powder comprising a plurality of substantially spherical composite particles each comprising a mixture and/or alloy of constituent metals, (i) the particles have a Hall flow rate ranging from approximately 1 s/50 g to approximately 25 s/50 g, and (ii) an outer surface of each of the particles comprises a plurality of grains, each grain being surrounded by a matrix, the grains comprising the first constituent metal, and the matrix comprising the one or more second constituent metals; forming a first layer of a shaped part; disposing a layer of the particles over the first layer of the shaped part; forming subsequent layers of the shaped part; and sintering the shaped part to form the three-dimensional object.