The 2024 aluminum alloy (Al-Cu-Mg) is widely used in aerospace; however, due to its solidification-cracking tendency, processability using laser powder bed fusion (LPBF) remains a critical issue. addition of 2 wt% CaB6 nanoparticles induces columnar-to-equiaxed transition (CET), resulting an immediate improvement LPBF processability. High-density (>99.5%) and crack-free specimens, with homogene...