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Coupling phase field and visco-plasticity to study rafting in Ni-base superalloys

Abstract : An elasto-visco-plastic model is developed to study the microstructural evolution during a creep loading in a model AM1 superalloy. Elastic anisotropy and inhomogeneity, as well as the description of long range order in the L12 γ' phase are included in the model. Plastic activity is introduced using a continuum crystal plasticity framework at mesoscale. A special attention is paid on the corresponding parameters identification from experiments. Two dimensional simulations of creep in the [100] direction are performed, and the results are compared to the predictions of an elastic phase field model, in order to characterize the influence of plastic activity on the microstructural evolution. In particular, our simulations show that plastic activity in the γ channels significantly increases the rafting kinetics and allows misalignments of rafts with respect to cubic directions. The simulation results are critically discussed and improvements of the model are proposed.
Keywords : Physical Sciences
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Submitted on : Saturday, January 15, 2011 - 2:56:20 AM
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Anaïs Gaubert, yann Le Bouar, Alphonse Finel. Coupling phase field and visco-plasticity to study rafting in Ni-base superalloys. Philosophical Magazine, Taylor & Francis, 2010, 90 (01-04), pp.375-404. ⟨10.1080/14786430902877802⟩. ⟨hal-00556061⟩



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