Nanometer scale study of segregation at heterophase interfaces of molybdenum nitride precipitates in an α-iron matrix

Dieter Isheim*, Roseann Csencsits, David N. Seidman

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

We are studying heterophase interfaces between molybdenum nitride precipitates and an α-iron matrix on a nanometer scale by electron and atom-probe field-ion microscopies. Fe-2 at.% Mo-0.5 at.% Sn and Fe-2 at.% Mo-0.4 at.% Sb are internally nitrided by annealing in an NH3 / H2 atmosphere. Nitridation at 550°C produces coherent thin platelet-shaped molybdenum nitride precipitates, while at 600°C semicoherent coarse plates and spheres also form. Segregation of Sn and Sb is observed at the heterophase interfaces of only the semicoherent precipitates. The loss of coherency, that is the formation of misfit dislocations, is essential for substantial interfacial solute segregation to occur at heterophase interfaces.

Original languageEnglish (US)
Pages (from-to)Y1021-Y1026
JournalMaterials Research Society Symposium - Proceedings
Volume652
StatePublished - Dec 1 2001
EventInfuences of Interface and Dislocation Behavior on Microstructure Evolution - Boston, MA, United States
Duration: Nov 27 2000Nov 30 2000

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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