High-temperature phase equilibria in the system Zr-O-N

Alexandre Ermoline, Mirko Schoenitz, Edward L. Dreizin

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Powders of Zr, ZrO2, and ZrN were mixed and pressed to produce samples with different bulk stoichiometries in the ternary Zr-O-N systems. The samples were laser heated above melting, maintained at a high temperature, and quenched. The processed samples were cross-sectioned and studied using scanning electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffraction. The results pointed to the location of the ternary invariant point Liquid + Gas + ZrO2 + ZrN on the high-temperature portion of the Zr-ZrO2-ZrN phase diagram. The ternary liquidus in the Zr-O-N system was further constrained based on the comparison of the results obtained in this work with composition histories of zirconium particles burning in air reported earlier. Elemental analysis of nitrogen-rich inclusions found in the samples showed the existence of an extended compositional range for ternary solid Zr-O-N solutions. X-ray diffraction analysis of the quenched samples indicated that these solutions are likely to be derived from the ZrN phase. A preliminary outline of the subsolidus ternary Zr-ZrO2-ZrN phase diagram is constructed based on these findings and the interpretations of the well-known binary Zr-O and Zr-N phase diagrams.

Original languageEnglish (US)
Pages (from-to)320-328
Number of pages9
JournalJournal of Materials Research
Issue number2
StatePublished - Feb 2006

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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