Abstract
Optical and electron microscopy on dimolybdenum carbide single crystals revealed a veining substructure on all planes of the as-grown crystals. Electron diffraction showed these veins to be hexagonal Mo 2C, determined by chemical and electron microprobe analyses to be off-stoichiometric Mo 2C 0.97. Annealing in vacuum at 1600°–2000°C decreased the number of veins present. A substructure transition from veins to bands was observed after annealing at 2000°C, associated with γ'-MoC and Mo formation. Annealing at 2200°C or above caused the formation of bands found to be primarily Mo. The veining process is postulated to be due to a solidification and precipitation process. Polygonization of the veining substructure occurred during annealing below 2200°C. Room-temperature microhardness data on as-grown and annealed crystals further substantiated these findings.
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