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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

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 (US)
Pages (from-to)81-84
Number of pages4
JournalScripta Materialia
Volume56
Issue number2
DOIs
StatePublished - Jan 2007

Funding

We thank Y. Mishin for stimulating discussions and E.I. Isaev for help with generating a pseudopotential for Nb. This work was supported by the AFOSR under grant FA9550-04-1-0013, by computer time grants at NAVO, ARSC and MHPCC, and in part by the Netherlands Organization for Scientific Research (NWO project 47.016.005).

Keywords

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

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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