fig2

Figure 2. Heterogeneous microstructures induced by cellular structure. (A-C) Microstructural characterization on the longitudinal cross sections in L-PBFed AlSi10Mg; (D) Schematic diagram of the formation mechanism for microstructure heterogeneity in the L-PBFed AlSi10Mg^[61]. (E) SEM image showing multiple cellular structures across the whole melt pool in the L-PBFed Al-Ni-Sc-Zr alloy; (F-H) Magnified images of the white squares indicated by the dashed lines in (E); (I) Microstructure selection map of Al-5.6Ni alloy (wt.%) with the red line referring to the solidification path of L-PBFed Al-Ni-Sc-Zr alloy; (J) Variations of temperature gradient (G) and solidification velocity (V) at the solidification interface; (K) Curves depicting G × V and G/V within the melt pool; (L) Experimentally measured cell spacing (λ₁)^[67].