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The V-VO phase system

  • Alloy Phases and Structure
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Abstract

A phase diagram is proposed for the V-VO system based on melting point determinations, differential thermal analyses, metallographic observations, and X-ray parametric measurements. A eutectic reaction occurs at 1640°C and 29 at. pct O. The intermediate phases V9O and V2O form peritectoidally at 510° and 1185°C, respectively, while V4O forms by a peritectic reaction at 1665°C. The VO phase melts congruently at 1790°C. The terminal solubility of oxygen in vanadium increases from 3.2 at. pct at room temperature to a maximum of 17.0 at. pct at the peritectic temperature. There is also extensive solid solubility associated with each of the intermediate phases. Two martensite-like phases form in alloys in the composition range 6 to 9 at. pct O upon quenching from above the 510°C peritectoid horizontal.

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Authors and Affiliations

  1. Institute for Atomie Research and Department of Metallurgy, Iowa State University, Ames, Iowa

    D. G. Alexander (Assistant Metallurgist) & O. N. Carlson (Senior Metallurgis and Professor)

Authors
  1. D. G. Alexander
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  2. O. N. Carlson
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Alexander, D.G., Carlson, O.N. The V-VO phase system. Metall Trans 2, 2805–2811 (1971). https://doi.org/10.1007/BF02813255

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  • DOI: https://doi.org/10.1007/BF02813255

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