Surface Segregation of Chromium in Fe-20 mass%Cr Single Crystal Accompanied with Trace of Nitrogen

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Abstract

Surface segregation in an Fe-20 mass%Cr single crystal alloy was investigated by using Auger electron spectroscopy with in situ heating. Segregation of chromium to the free surface took place by heating above about 750 K. The experiment of the segregation kinetics showed that the segregation process was controlled by diffusion of chromium in the alloy. In spite of the low concentration of residual nitrogen in the alloy, remarkable surface segregation of nitrogen was also observed. It was shown that the segregation of nitrogen was strictly correlated with that of chromium through the segregation process. It may result from an attractive interaction between chromium and nitrogen in the segregated layer on the surface. A model for the segregation behavior was proposed, and the effect of the interaction between solutes on the interface segregation was discussed with previous results.

Original languageEnglish
Pages (from-to)1085-1091
Number of pages7
JournalMaterials Transactions, JIM
Volume31
Issue number12
DOIs
Publication statusPublished - 1990 Jan 1
Externally publishedYes

Keywords

  • Auger electron spectroscopy
  • chromium segregation
  • iron-chromium
  • nitrogen segregation
  • surface segregation

ASJC Scopus subject areas

  • Engineering(all)

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