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Published in:
2016 | OriginalPaper | Chapter
Some Steps towards Modelling of Dislocation Assisted Rafting: A Coupled 2D Phase Field — Continuum Dislocation Dynamics Approach
Authors : Ronghai Wu, Stefan Sandfeld
Published in: TMS 2016 145th Annual Meeting & Exhibition
Publisher: Springer International Publishing
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The interaction between edge dislocations and γ′ precipitates as in nickel-based super-alloys is studied by coupling a phase field model and a 2D continuum dislocation dynamic model. Various stresses, which serve as communicator between dislocations and precipitates, are calculated by an eigenstrain method for both the γ/γ′ misfit and the dislocations. Our simulations show how edge dislocations tend to move to and pile up at specific γ/γ′ interfaces. The growth of γ′ is inhibited at the interface where dislocations are piling up, due to the reduction of elastic energy. The potential of our coupled model for simultaneous microstructure patterning and mechanical property prediction is discussed.