Carbon-vacancy interactions in austenitic alloys

J. A. Slane, C. Wolverton, R. Gibala*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Several research results suggest the binding energy of carbon-vacancy (C-V) complexes is of the order 35-55 kJ/mole in face-centered cubic (fcc) iron-base alloys. In addition to point-defect anelasticity, we examine data on self-diffusion of Fe in fcc Fe, which are quantitatively consistent with our results on point-defect structure modeling. Quenching, cold work, and electron irradiation increase the height of damping peaks associated with C motion, consistent with a contribution of C-V complexes to the relaxation strength of these peaks. The effect of increasing C content on self-diffusion of Fe in fcc Fe is to decrease the activation energy for self-diffusion, hence increase the diffusivity, and implies a C-V binding energy of ∼40 kJ/mol. We have used first-principles gradient-corrected density functional calculations to determine directly the binding energy of nearest-neighbor C-V pairs in fcc iron. A value of ∼35 kJ/mol is obtained.

Original languageEnglish (US)
Pages (from-to)67-72
Number of pages6
JournalMaterials Science and Engineering A
Volume370
Issue number1-2
DOIs
StatePublished - Apr 15 2004

Keywords

  • Anelasticity
  • Austenitic alloys
  • Carbon-vacancy binding
  • Point defects

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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