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Metastable and equilibrium phases in dilute V-N alloys

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Abstract

Alloys of vanadium containing 0 to 10 at. pct nitrogen were prepared and aged at temperatures from 300 to 950°C. The nitrogen solvus line was determined and the discontinuities are discussed in terms of the phases coexisting with the α-phase at various temperatures. Aging temperatures greater than 550°C produced only V3N in equilibrium with the α-phase. Aging at 550°C and below resulted in a sequence of transformations beginning with the precipitation of V16N from supersaturated α-phase. This transformation was followed by the decomposition of the V16N into two other metastable phases, termed VxN and VγN. Longer aging times at 550°C resulted in dissolution of VγN and resultant large discs of V*N precipitate. Further aging yielded V3N. Except for the α-phase, the phases involved in this sequence have nitrogen atoms which are ordered. The crystal structures of both the vanadium atoms and the nitrogen atoms in VxN and VγN are presented and discussed. VN is shown to be bet while VγN is bcc with respect to the vanadium atoms. The morphology of the precipitates is described and discussed in terms of their crystal structures.

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Authors and Affiliations

  1. Materials Science Division, Argonne National Laboratories, 60439, Argonne, 111

    Donald I. Potter (Assistant Metallurgist)

  2. General Electric Company, Electronics Park, 13200, Syracuse

    Howard D. Epstein (Manufacturing Management Trainee)

  3. University of Rochester, 14620, Rochester, N. Y.

    Barry M. Goldstein (Graduate Student at School of Medicine)

Authors
  1. Donald I. Potter
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  2. Howard D. Epstein
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  3. Barry M. Goldstein
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Additional information

Formerly Assistant Professor, Department of Mechanical Engineering, Union College

Formerly Graduate Student, Department of Mechanical Engineering, Union College

Formerly student in Department of Physics, Union College

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Potter, D.I., Epstein, H.D. & Goldstein, B.M. Metastable and equilibrium phases in dilute V-N alloys. Metall Trans 5, 2075–2082 (1974). https://doi.org/10.1007/BF02644501

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