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

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 min...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2012-02, Vol.92 (5), p.608-634
Main Authors: Vorontsov, V.A., Voskoboinikov, R.E., Rae, C.M.F.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
dislocation dissociation
Exact sciences and technology
extrinsic stacking faults
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
phase field model of dislocations
Physics
Precipitation
primary creep
Shockley partials
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Summary: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.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2011.630691