Microstructural Characterization of Commercial Hot‐Pressed Boron Carbide Ceramics

Abstract

Two commercial hot‐pressed boron carbide ceramics were investigated by transmission electron microscopy. Atomic‐scale observations suggest that the grain boundaries of the two materials are free of grain‐boundary films. Two triple‐junction phases were found and characterized to be rhombohedral Fe 2 B 103 and orthorhombic Ti 3 B 4 . In addition, intra‐granular precipitates, AlN, Mo 2 (C, B) and graphite, were identified and found to have coherent relationships with the boron carbide matrix. Micron‐scale inclusions were also observed and most of them were determined to be graphite. The formation mechanisms of the secondary phases and their possible influence on mechanical properties are also discussed.