Surface hardening and precipitation behaviors in plasma-nitrided Fe-(2-x) at%Al-x at%Ti alloys

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Synopsis: The alloying effects of Ti, which is strongly attracted to nitrogen (N), on nitride precipitation and the resultant surface hardening in nitrided Fe-Al-Ti alloys, were investigated using three-dimensional atom probe tomography. Ti addition promotes nucleation of Al nitrides, which leads to substantial surface hardening. As the amount of added Ti increases, the hardness near the surface increases because the nucleation of Al nitrides is promoted, likely due to the higher density of Ti-N clusters. However, the effect of Ti on surface hardening by nitriding in Fe-Al alloys is weaker than that of V addition, as reported previously, although Ti is a stronger cluster-forming element than V. These results suggest that, in addition to the ability to form clusters, the potency of clusters for AlN nucleation needs to be considered to control AlN precipitation by solute clustering.

Original languageEnglish
Pages (from-to)202-211
Number of pages10
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number2
Publication statusPublished - 2019 Feb


  • Cluster
  • I-s interaction
  • Nitriding
  • Precipitation
  • Three dimensional atom probe

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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