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The logo of the International Metallographic Society represents an ideal structure for a polycrystalline material. Each crystal or grain is formed by the combination of cubic and octahedral habits. The octahedral faces truncate the corners of a cube, producing new edges on the cube face and three additional edges on each octahedral face. Truncation is such that the length of the edge common to cubic and octahedral faces is equal to the edge common only to octahedral faces. This structure, known as a tetrakaidecahedron (14 sided), may be stacked so that it completely and uniformly fills three-dimensional space. |
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