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 language | English (US) |
|---|---|
| Pages (from-to) | Y1021-Y1026 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 652 |
| State | Published - 2001 |
| Event | Infuences of Interface and Dislocation Behavior on Microstructure Evolution - Boston, MA, United States Duration: Nov 27 2000 → Nov 30 2000 |
Funding
This research is supported by the National Science Foundation (B.A. MacDonald, grant officer) under Grant DMR-9728986. D.I. received partial support through the Max Planck Research Prize of D.N.S. and from the Deutsche Forschungsgemeinschaft. R.C. wishes to acknowledge support from the U.S. Department of Energy, Office of Science, under Contract W-31-109-ENG-38. The authors wish to thank P. Epps, A. Pyzyna, E. Siem, and E. Spoerke, who were supported by NSF/REU grants, and M. Potter, and I. Uttayarat for their contributions to this research.
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering