Nanometer-scale solute segregation at heterophase interfaces and microstructural evolution of molybdenum nitride precipitates

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10 Scopus citations

Abstract

The interrelationship between coherency and solute segregation at metal/metal-nitride heterophase interfaces is studied on a subnanometer scale by both atom-probe field-ion and electron microscopies for molybdenum nitride precipitates in Fe-2at% Mo-X, where X=0.4at% Sb or 0.5at% Sn. Internal nitridation at 550°C generates thin platelet-shaped molybdenum nitride precipitates, while nitridation at 600°C produces, in addition to the small-scale structure with precipitates of the thin-platelet type, a much coarser structure of thick plates and spheroidal precipitates. The solute species Sn and Sb segregate at the heterophase interfaces of the coarse precipitates and Gibbsian interfacial excesses of up to 7×1018m-2 are measured. The segregation is related to the presence of misfit dislocations at the interfaces of the coarse preciptitates, while the thin plates remain coherent with no detectable segregation.

Original languageEnglish (US)
Pages (from-to)195-202
Number of pages8
JournalUltramicroscopy
Volume89
Issue number1-3
DOIs
StatePublished - Jan 1 2001

Keywords

  • Atom-probe field-ion microscopy
  • Internal interfaces
  • Internal nitridation
  • Solute segregation
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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