Two isomorphous borides extracted from different superalloys possess a double boride structure, involving metal atoms of varying size. The structure is tetragonal with c/a = 0.54 and belongs to space group P4/mbm. It consists of larger metal atoms located at the vertices of directly stacked 3 ~ . 4.3.4 semi-regular-tessellation layers with smaller metal atoms at the centers of square prisms and boron at the centers of triangular prisms. Boron atoms occur in isolated bonded pairs.
ExperimentalA new boride structure has been found in alloys ttS-88 and Incoloy 901, each with around 0.1% boron addition. The borides were extracted electrolytically from unaged specimens and examined by X-ray powder analysis. Small amounts of TiC were also present in both extracts. Incoloy 901 without boron does not produce this structure.
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