The role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in two-phase γ/γ′ superalloys

Yu N. Gornostyrev, O. Yu Kontsevoi, K. Yu Khromov, M. I. Katsnelson, A. J. Freeman

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The relative role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in γ/γ′ alloys was investigated on the basis of ab initio calculations. We show that over a wide temperature range, up to approximately 0.6Tmelt, the lattice misfit is determined by the difference in thermal expansion of γ and γ′ phases and exhibits only a slight variation. For higher temperatures, the redistribution of the major alloy components between the phases becomes a leading contribution to the lattice misfit.

Original languageEnglish
Pages (from-to)81-84
Number of pages4
JournalScripta Materialia
Volume56
Issue number2
DOIs
Publication statusPublished - Jan 1 2007

Keywords

  • Ab initio electron theory
  • Lattice misfit
  • Nickel alloys
  • Platinum group metals
  • Thermally activated processes

ASJC Scopus subject areas

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

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