Abstract
We have investigated the structure of planar carbide particles of several hundred nm in diameter and 10–50 nm in thickness, formed in a Nb–19%Mo alloy during a creep test at 1773 K. The planar particles are composed of the face-centered cubic (fcc) NbC phase. They precipitate in a partially coherent manner with habit planes close to {10 3 0} bcc or {3 1 0} bcc; while the orientation relationship (OR) is close to (1 0 0) bcc//(1 1 0) fcc, [0 0 1] bcc//[0 0 1] fcc, which is the well-known Bain OR, with a rotational mismatch of 5.7 ± 0.2° around the [1 0 0] bcc axis. Numerous {1 1 1} fcc stacking faults exist inside the precipitates, suggesting they deformed plastically during growth. These findings are in excellent agreement with predictions provided by the invariant line theory.
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