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Surface segregation and interaction of oxygen and nitrogen with zirconium in Nb-1% Zr alloy

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Abstract

Surface segregation and interaction of zirconium, oxygen and nitrogen were studied in a Nb-1 pct Zr alloy utilizing Auger electron spectroscopy. Segregation of oxygen to the surface occurs at temperatures as low as 500°C with the maximum occurring around 1300°C. Oxygen at the surface appears to be in two states, of which one corresponds to a strongly bound state with zirconium. Oxygen in this state, like zirconium, does not redistribute into the bulk at high temperatures. Segregation of nitrogen to surfaces is observed in samples cooled from temperatures above 1000°C. The segregation of Zr, O and N are all limited to a few monolayers near the surface. When heated above 1500°C, oxygen and zirconium are removed from the sample probably in the form oxides of Zr and Nb.

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Authors and Affiliations

  1. Brookhaven National Laboratory, 11973, Upton, New York

    A. Joshi (Assistant Metallurgist), M. N. Varma (Associate Scientist) & M. Strongin (Physicist)

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  1. A. Joshi
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  2. M. N. Varma
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  3. M. Strongin
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Joshi, A., Varma, M.N. & Strongin, M. Surface segregation and interaction of oxygen and nitrogen with zirconium in Nb-1% Zr alloy. Metall Trans 5, 861–863 (1974). https://doi.org/10.1007/BF02643139

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  • DOI: https://doi.org/10.1007/BF02643139

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