A TEM study on the semicoherent precipitates in a Nb-19%Mo alloy

Toyohiko J. Konno, Eri Miura, Atsushi Tanaka, Shuji Hanada

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13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1783-1789
Number of pages7
JournalActa Materialia
Issue number6
Publication statusPublished - 2005 Apr


  • Interface structure
  • Phase transformation
  • Precipitation
  • Transmission electron microscopy


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