The reinforcement of aluminum alloys with ceramic particles leads to aluminum matrix composites (AMCs) with increased mechanical properties, which makes them an interesting material for additively manufactured lightweight structures in automotive and aerospace industries. By using a powder metallurgical production route, a homogeneous distribution of the reinforcing particles in the matrix can be achieved by high-energy ball-milling (HEBM). In this study, the suitability of composite powders AlSi10Mg with 5 vol% SiC and 5 vol% Al2O3 for processing by laser powder bed fusion (PBF-LB) is studied. The composite powders have a non-spherical shape that leads to a reduced flowability and a decreased density. The effect of thermal treatments to the powder morphology is investigated with the focus on a spherical shape. The evaluation of the PBF-LB process is done with respect to porosity of the specimens. The distribution of the SiC particles as well as the microstructure is studied before and after the PBF-LB process by means of scanning electron microscopy. The porosity is determined by light microscopy analyses (2D) for all specimens as well as computed tomography (3D) for selected samples. Finally, the mechanical properties are determined by macro-hardness and micro-hardness indentation tests.