In this study, (100-x)Al6061-x%Sm2O3 (x: 5, 10, 20, 30, and 40) composites were produced by powder metallurgy. The powder composites produced by mechanical alloying were pressed into pellets and subsequently sintered to eliminate voids. The structural properties of the sintered pellets were analyzed using X-ray diffraction, energydispersive X-ray spectroscopy, and scanning electron microscopy. Mechanical properties were evaluated by density, microhardness, and corrosion tests. Sm2O3 doping was measured to increase the relative density and microhardness of the composite while decreasing the corrosion resistance. The radiation shielding properties of the composites were calculated using the MCNP 6.2 simulation code and Phy-x/PSD program. Sm2O3 doping was calculated to increase the thermal neutron macroscopic cross-section from 2.71 cm- 1 to 24.76 cm- 1 and the thermal neutron attenuation rate from 23.76 % to 91.59 %, increasing from 5 % to 40 %. The Sm2O3 doping also increased the gamma-ray liner absorption constant from 0.198 cm-1 to 0.243 cm- 1 at an energy of 0.661 MeV. This research is expected to provide essential data for researchers investigating the mechanical and radiation shielding properties of Al-Sm2O3 composite.