Shearing of γ′ precipitates in Ni-base superalloys: a phase field study incorporating the effective γ-surface

V. A. Vorontsov, R. E. Voskoboinikov, C. M.F. Rae

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

An extended phase field model of dislocations in Ni-base superalloys is presented. It incorporates the recently developed effective γ-surfaces for both matrix and precipitate phases, obtained from atomistic simulations. These novel γ-surfaces feature extrinsic stacking faults as additional local minima. Thus, they offer an increased number of available dislocation dissociation pathways within the phase field system. The new model has been used to simulate a variety of mechanisms for γ′ precipitate shearing proposed in literature. A critical assessment is made based on the modelling observations.

Original languageEnglish
Pages (from-to)608-634
Number of pages27
JournalPhilosophical Magazine
Volume92
Issue number5
DOIs
Publication statusPublished - 11 Feb 2012

Keywords

  • dislocation dissociation
  • extrinsic stacking faults
  • phase field model of dislocations
  • primary creep
  • Shockley partials

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