The effect of platinum on defect formation energies in β-NiAl

K. A. Marino, E. A. Carter

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

First-principles density functional theory is used to examine the effect of Pt on point defects and defect clusters in NiAl. It is found that Pt promotes the formation of Ni and Al vacancies and Ni and Al antisite atoms. Defect clusters that are minima in postulated Ni diffusion mechanisms in NiAl are also found to be stabilized by the presence of Pt. By decreasing defect formation energies, Pt may decrease the overall activation barrier to the diffusion of Ni and Al in NiAl. The results provide clues as to how Pt enhances thermal barrier coating lifetime.

Original languageEnglish (US)
Pages (from-to)3502-3510
Number of pages9
JournalActa Materialia
Volume56
Issue number14
DOIs
StatePublished - Aug 1 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Keywords

  • Density functional theory
  • Diffusion
  • Nickel aluminides
  • Platinum
  • Point defects

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