<p>Aluminum metal matrix composites with dispersed quasicrystalline reinforcements exhibit attractive combinations of properties, and they could form the basis of novel alloy systems for additive manufacturing (AM) if the quasicrystalline phases can be retained or formed during the AM process. Recent results from laser glazing studies have suggested that Al-Cr-Mn-Co-Zr alloys could be good candidates for AM by laser powder bed fusion (LPBF) since the alloys form dispersions of the quasicrystalline icosahedral phase (I-phase) under appropriate conditions. Here, a series of LPBF trials has been performed using gas-atomized Al-Cr-Mn-Co-Zr alloy powder and laser parameters optimized for other high-strength Al- and Ti-based alloys. All the builds exhibited the same microstructural zones (melt pools, heat-affected zones and melt pool boundary layers) with the main differences being the relative extent of the zones and the length scale of the phases within them. The melt pool microstructures comprised coarse columnar Al grains with equiaxed I-phase dispersoids and nanoscale Al₉Co₂ precipitates. The heat-affected zones contained additional fine precipitates of Al₃Zr, Al₄(Cr,Mn), and Al₄₅(Cr,Mn)₇ phases together with finer recrystallized Al grains. The boundary layers had no I-phase but instead exhibited coarse equilibrium Al₁₁(Cr,Mn)₂ phases with leaf- or needle-like morphologies. Microindentation data revealed that the heat-affected zones and boundary layers were softer than the melt pools due to a reduction of solid solution and/or dispersion strengthening effects, and these were related to the trends in macro-hardness for the builds. These data confirm that there is significant potential for developing alloys for LPBF in this system, but that process parameters would need to be optimized to control the extent of the softer microstructural regions in the build microstructures.</p>