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FACE CENTERED CUBIC. STRUCTURE (FCC). • Close packed directions are face diagonals. --Note: All atoms are identical; the face-centered atoms are FCC (face centered cubic): Atoms are arranged at the corners and center of each cube face of the cell. Atoms are assumed to touch along face diagonals. 4 atoms in one unit cell. Atoms are arranged at the corners of the cube with another atom at the cube center. --Note: All atoms are identical; the face-centered atoms are shaded differently only for ease of viewing. FACE CENTERED CUBIC. STRUCTURE (FCC). Page 14 Body Centered Cubic Structure, fig.lb or an Hexagonal Close Packed structure fig.lc. These are usually abbreviated to FCC, BCC or HCP structures respectively. 3 Stacking Faults. Many metals crystallize into the close-packed structures, fcc and hexagonal close packed (hcp), in which the atomic planes of triangular Oct 28, 2019 ->90% of elemental metals crystallize upon solidification into 3 densely packed crystal structures: Body-centered cubic. (bcc) ex.: Fe, W, Cr. Face-centered cubic. Face-Centered Cubic (FCC) Structure. • Unit cell contains: 6 x 1/2 + 8 x 1/8 = 4 atoms/unit cell. • Coordination number = 12. • Close packed directions are face. --Note: All atoms are identical; the face-centered atoms are shaded differently only for ease of viewing. FACE CENTERED CUBIC STRUCTURE (FCC). • --Note: All atoms are identical; the face-centered atoms are shaded differently only for ease of viewing. FACE CENTERED CUBIC STRUCTURE (FCC). • Introduction To Materials Science, Chapter 3, The structure of crystalline solids. University of centered cubic (FCC), the body-centered cubic (BCC) and the