fig7

Figure 7. Core-shell structures created by LAM techniques: (A and B) Microstructure perpendicular to building direction (BD) of the SLM-AlCoCrFeNi_2.1; (C and D) Microstructure parallel to BD; (E and F) The micrograph of core-shell structure; (G) The micrograph of lamellar structure; (H) The micrograph of nanoprecipitate and bridge^[94]. (I) pseudo-3D microstructure of SLM-Al_0.5CrCoFeNi; (J) Quantitative compositional analysis by atom probe tomography (APT) shows the distribution of different elements in the face-centered cubic cells and B2 phase on the boundaries; (K) IPF map showing the near-uniform crystallographic orientation in different grains; (L) the corresponding phase map showing the consistent distribution of the B2 (body-centered cubic) phase on the face-centered cubic cell boundaries; (M) TEM images show the morphology of the B2 phase on the boundaries, with the magnified images from locations 1, 2, and 3 showing the nanometer-scale bridges (nano-bridges), where high-density dislocations are observed^[95].